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Computers and electronic equipment for hobby, work and laboratory use

Welcome to this presentation of good online stores for computers, periferials and other electronic equipment, and of some interesting products from the stores. Pleace click om the links to see more or to buy.

 

Good computing networking and accessory stores

Featured products - docking stations and protective cases

Product examples - computers

Product examples - keyboards, printers and peripherials

Batteries and chargers for computers, cellphones and other devices

Main page with hobby electronics and links to all electronics product pages

Information about data store media

 

 

COMPUTERS AND NETWORKING STORES

Here are presented some good online shops where you can find a lot of data equipment, like: Computers, Dektops, Laptops, Notebooks Tablets, Televisions, DVD Players / Recorders, Home Audio / Video, MP3 Players / iPod Accessories, Satellite Radio, Headphones, Mobile Audio / Video, GPS / Navigation, Home Electronics, Telephones & Fax, Personal Electronics, Electronic Accessories

DinoDirect - a great shop or computers, electronics and other advanced equipment for reduced prizes - This is a general shop where you can find advanced things from many categories for a greatly redused prize. The shop has a huge inventory of computers like netbooks and laptops, computer accessories, networking accessories, batteries, battery adapters, printers, keyboards, mice, perieferials and other electronic items.

DinoDirect Free Shipping


Focal Prize - a great shop of netbook and laptop computers and all kind of computer periferials, and also other types of electric products - In the shop you can find cables and converters, keyboards , mouse, laptops and accessories, networking, microphones and speakers, USB gadgets, PC components and accessories, USB flash drives, printer dupplies & accessories, bluetooth adapters, PC cameras and webcams, lamps and lighting and much more.

8% Off computers & networking, code: AFF8OFF


PrizeAngels - All kind of techical devices for discounted prices - Cellphones, tablet PCs, watches, adaptors, power units, modems, btteries, cables, antennas, keyboards, controllers, gamegear. Also jewelry, apparel, body care products and a lot more.

All Discount items gathered @PriceAngels.com


Ink, paper and accessories for periferials and accessories for offices, schools and other workplaces - all types - Here you can find inkjet cartridges for  good prizes to most ink printers of most brands, examples: Newgen Sys, Next Comp, Nixdor, Nokia, North Atlantic, Northern Telecom, O Top , OCE, Okidata, Olivetti, Olympia, Omnifax, Omniprint, S Top, Sagem, Samsung, Sanyo, Savin, Scan-Code, Selex, P Top, Pacific Data, Panasonic, Philips, Pitney Bowes, Primera Tech, Privileg, Sharp, Siemens, Sony, Spec. Printing Sol, Stielow, Summagraphics, Sun Microsystems, T Top, Tally/Mannesmann, TEC, Tektronix, Telecheck, Telekom, Tidemark. You also find other accessories like: Laser toner, ribbons, solid ink, blank CD/DVD, scrapbooking and cables

Happy Holidays from Concord Supplies!


Skins and styling products for your computers, phones and for all your other electronic equipment - In this great shop you can find skins and covering accessories to give your electronic devices a personal and nice look.

DecalGirl.com - Personalize Your World!


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DOCKING STATIONS AND PROTECTIVE CASES FOR COMPUTERS, TABLETS AND CELLPHONES

The exhibited products from the above presented and other good sources are only examples. By clicking at the links you get into a shop where you can search for a lot of other desktop or notebook computers.

A product to protect your iPad and to enhance visibility and ergonomics - This products serves several practical functions for your iPad. It protects it during travel and use. It let it stand or lay in a position that makes it easy to read. It gives it a practical keyboard so that you are not dependent of using screen touching all the time.

ClamCase All-in-One Keyboard Case & Stand


Targus ACP77USZUniversal Usb3 Docking Station

Targus ACP77USZUniversal Usb3 Docking Station

To leverage innovative marketing and global distribution to deliver solutions that make mobile technology easier, more productive, and more enjoyable. Targus Group International, Inc. pioneered the notebook carrying case category, partnering with corporations, retailers, and OEMs to provide the best possible protection for notebook PCs. Targus continues to define and shape the market for mobile computing cases and accessories. As the leading global supplier of portable solutions, Targus has offices on every continent and distributes in over 145 countries. Targus Universal USB 3.0 DV2K Docking Station with Power (Black)




Universal Multifunctional Hard Drive Docking Station

Universal Multifunctional Hard Drive Docking Station

Unique design, you can put HDD in the Universal Hard Drive Docking Station. This design Universal Hard Drive Docking Station is very multifunctional and convenient for using. This USB Hard Drive Docking Station can be used for many purposes and provides portability between desktop and laptop, or home and office. Lightweight, compact and portable design, it is easy to carry. The Hard Drive Docking Station is famous around the world.




Targus Universal USB3 Docking Station

Targus Universal USB3 Docking Station

Targus Universal USB 3.0 SV Docking Station




Built in Hard Drive Docking Station

Built in Hard Drive Docking Station

This 2.5Inch eSATA Universal Hard Drive Dock is an innovative idea of getting SATA(Serial ATA) and IDE(PATA) interface integrated into one docking station for immediate folder access. It gives a more convenience way of plugging 2.5SATA HDD into this special design docking station at the same time. The Hard Drive Dock is a complete and easy way to add or swap hard drives to your computer. HDD Docking Station gives you the flexibility of connecting the IDE/SATA(I/II)hard drive to your computer via eSATA connection without opening up your computer case or installing into an enclosure.




Mutant Station Docking Station for Iphone Ipad - MIGIP2

Mutant Station Docking Station for Iphone Ipad - MIGIP2

One of the biggest drawbacks of owning an iPhone or iPad is transferring information between it and another device. One of the most common ways to transfer and store data is on an SD card but this card is not supported on the iPhone or iPad. Until now.

Just dock your device insert your SD card and the information is transferred with the push of a button. You can copy photos videos documents or any other types of data. This is great for getting those photos off your cameras SD card and onto your iOS device for sharing without the need for computer!.

  • Input Voltage: 9 V DC.
  • Frequency Response: 50 Hz to 20 kHz.
  • Speaker Configuration: 2.0.
  • RMS Output Power: 10 W.
  • Memory Card Slot: Yes.
  • Memory Card Supported: Secure Digital (SD).
  • USB: Yes.
  • iPod Supported: Yes.




  • Multi-function Dual-slot Hard Disk Docking Station for 2.5

    Multi-function Dual-slot Hard Disk Docking Station for 2.5" & 3.5" IDE, SATA, ESATA(Black)

    Features Multi-function hard disk docking station with card slot With 2 USB2.0 Hub Supports CF/TF/SD/XD/MS card reader Supports one touch backup (OTB) function Can be used for both 2.5"/3.5" SATA IDE hard disk High speed USB2.0 data transfer rate up to 480Mbp/s Plug and play Power LED indicator General Specs Card Reader CF, TF, SD, XD, MS card Power Interface ESATA, and USB port Output 12V Input 100-240V Operating System Windows 98/ME/2000, Mac OS Compatibility 2.5"/3.5" SATA 2.5"/3.5" IDE hard disk Dimensions 148 x 112 x 79 mm


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    SOME COMPUTERS FOR AFFORDABLE PRIZES

    MTK8312 Android 4.2.2 dual core tablet PC 7.85 inch

    MTK8312 Android 4.2.2 dual core tablet PC 7.85 inch

    Atmospheric orthodox design, easy to control with one hand, but also easy to carry, superior cooling capacity to maintain body temperature, to create a better operating environment, not fluent Caton.




    GDIPPO M978 3G Android 4.2.1Quad Core Tablet PC 9.7 Inch

    GDIPPO M978 3G Android 4.2.1Quad Core Tablet PC 9.7 Inch

    The highly responsive capacitive touch screen with high resolution 1024 x 768, more conformable to operate this Android tablet PC device




    GDIPPO Q10 Android 4.2.2 Tablet PC 10.1 Inch Dual camera

    GDIPPO Q10 Android 4.2.2 Tablet PC 10.1 Inch Dual camera

    10.1 inches HD capacitive screen, whether it is reading books, picture browsing, video playback, or game shows a larger area of the screen will allow users to enhance the entertainment experience a shocking level.




    ACER AMERICA NX.M12AA.032 NB 2.2GHz-4GB DDR3-500GB-W7HP-15.6 in. 5IN1 CARD READER-W7HP 64BIT ACER MODEL:ASE1-531-4665

    ACER AMERICA NX.M12AA.032 NB 2.2GHz-4GB DDR3-500GB-W7HP-15.6 in. 5IN1 CARD READER-W7HP 64BIT ACER MODEL:ASE1-531-4665

    NB PENTIUM B960 2.2GHz/4GB DDR3/500GB SATA HD/5IN1 CARD READER/W7HP64BIT /15.6ACER MODEL:ASE1-531-4665




    NB i32.4-4GB-500GB-15.6 in. -W8-DVDRW ASUS X55C-DS31 BLACK NOTEBOOK Black - 15.6 in. HD - 1366768- LED - In

    NB i32.4-4GB-500GB-15.6 in. -W8-DVDRW ASUS X55C-DS31 BLACK NOTEBOOK Black - 15.6 in. HD - 1366768- LED - In

    NB i32.4/4GB/500GB/15.6/W8/DVDRW ASUS X55C-DS31 BLACK NOTEBOOK Black / 15.6 HD (1366*768) LED / Intel Core i3-2370M (2.4GHz) Sandy Bridge / 4GB DDR3 / Intel GMA HD / 500GB 5400RPM / DL DVD RW/CD-RW / Windows 8 (64 bit) / 802.11BGN / 0.3MP / Bluetooth 4.0 / 1YR International/1YR Accidental Damage/30-Day Zero Bright Dot/2-way FREE shipping/24-7 tech support HDMI




    HP Business D8E66UT-ABA 6470b I5 3230m 14.0 500 4 Win8

    HP Business D8E66UT-ABA 6470b I5 3230m 14.0 500 4 Win8

    HP Smart Buy ProBook 6470b i5-3230M (3.1GHz/2.5GHz/3MB) 4 GB 1600 1D 500GB 7200 2.5 14.0 LED HD+ AG UMA: HD 4000 DVD RW 802.11a/b/g/n 2x2 BT Modem TPM+FS 720p HD webcam Win7 Pro 64 with Win8 Pro License 6-Cell 55Wh 3/3/0




    HP Business D8E77UT-ABA 2570p I5 3340m 12.5 180 4 Win8

    HP Business D8E77UT-ABA 2570p I5 3340m 12.5 180 4 Win8

    HP Smartbuy EliteBook 2570p i5-3340M (3.3GHz/2.6GHz/3MB) 4 GB 1600 1D 180GB SSD 12.5 LED HD AG UMA: HD 4000 DVD RW Centrino a/b/g/n 2x2 BT WWAN Upgradeable Modem TPM+FS 720p HD webcam Win7 Pro 64 with Win8 Pro License vPro 6-Cell 62Wh 3/3/0




    Lenovo Americas 24384KU Thinkpad LED Notebook Intel Core i7-3630QM

    Lenovo Americas 24384KU Thinkpad LED Notebook Intel Core i7-3630QM

    Rock-solid reliability. Blazing-fast performance. Clever manageability tools. We pack a lot of intelligent features into every ThinkPad laptop tablet and Ultrabook so you get more out. More productivity more cost savings more IT headache-busting. Thats why a ThinkPad investment isnt just smart. Its pure genius.

  • Processor Type: Core i7.
  • Processor Model: i7-3630QM.Processor Speed: 2.40 GHz.





  • YEAHPAD PILLBOX7 7.0" Android 4.0.3 A13 1.52GHz Tablet PC with Wi-Fi, 1080P HDMI Playback, Capacitive Touch (4GB) (Black) - Please click image

    10% Off YEAHPAD  7.0


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    COMPUTING ACCESSORIES - keyboards, projectors, mice, hard-drives, backup-devices, printers, periferials

    HP ENVY 5530 E-ALL-IN-ONE PRINTER (A9J40A#B1H) only $99.99.

    Dell Laser Printer B2360dn - printer - monochrome - laser (HJMR9) only $129.99.


    HP Mobile Printer and Notebook Case

    HP Mobile Printer and Notebook Case

    NOTEBOOK/MOBILE PRINTER CARRYING CASE




    HP LaserJet M551N Laser Printer

    HP LaserJet M551N Laser Printer

    LASERJET ENT 500 COLOR M551N 32PPM 1200X1200DPI USB 2.0 ENET 1GB




    Durable Portable 2m DisplayPort to HDMI Connector Cable

    Durable Portable 2m DisplayPort to HDMI Connector Cable

    This is a Durable Portable 2m DisplayPort to HDMI Connector Cable. This Cable is easy to use just plug. Useful and reliable, this cable will be your best choice. The Cable made of high quality materials, you can use it for long time. Using high quality connections is more important than ever, to get the most out of these technologies. This colorful connector cable will help to colorful your life. Don't miss this Portable Connector Cable.




    Media Combo MK200 Keyboard and Mouse

    Media Combo MK200 Keyboard and Mouse

    A durable keyboard-and-mouse combo that puts the things you do most just one touch away. Easy listening You can do more, faster with one-touch controls for instant access to music, volume, the Internet, and more. Feel-good typing Your hands will enjoy the low-profile, whisper-quiet keys and standard layout with full-size F-keys and number pad. Smooth ride You'll be moving along smoothly with a precise, high-definition optical mouse to help you get around.




    2.4GHz Wireless Keyboard and Optical Mouse

    2.4GHz Wireless Keyboard and Optical Mouse

    Notice:For supplier policy,this product only ship to US address!The I-Rocks RF-6572A wireless keyboard and optical mouse combo uses the latest 2.4GHz ISM RF Frequency Hopping technology to provide you with extended range and flawless communication between the keyboard, mouse, and your computer. Four automatically selected channels eliminate any possible interference when this keyboard and mouse combo is used around other RF devices. The 2.4GHz ISM RF Digital Radio technology allows the RF-6572A to stay connected to the devices in up to a 40 foot radius! Ideal when using your big flat screen TV as a monitor with Microsoft media extender devices.




    BUS0067 Corporate HID Keyboard and Mouse

    BUS0067 Corporate HID Keyboard and Mouse

    The Targus AMU81USZ USB Optical Mouse is a three-button mouse with an ergonomic design to provide comfort while in use. The integrated scroll wheel makes it easy to navigate through numerous pages at a quick pace. Featuring a USB-connection, this cost effective mouse is easy to use, simply plug and play. No driver is required. The USB Optical Mouse is also ambidextrous to suit both left and right handed users.




    V7 Professional Game Keyboard Multimedia Key Mute Design USB Keyboard

    V7 Professional Game Keyboard Multimedia Key Mute Design USB Keyboard

    The professional game chip, a game transmission speed than ordinary edition faster, the game more stable.This wired keyboard with High imitation game level elastic rubber design case can easily convert into a laptop style position for a more comfortable typing.The overall appearance the sharp-featured, overall modelling like a heavy armor, unique shape dazzle cool.




    KeyFolio 39512 Keyboard

    KeyFolio 39512 Keyboard

    The Kensington KeyFolio Pro 2 provides a high-performance removable keyboard optimized for the touch typist.




    4250400 Easy-View Keyboard

    4250400 Easy-View Keyboard

    Notice:For supplier policy,this product only ship to US address!Digital Innovations Easy-View Keyboard The Easy-View 110-key classic keyboard features a USB connection and large font keys for easy reading.




    2.4G Mini Wireless Keyboard

    2.4G Mini Wireless Keyboard

    Do you feel inconvenient when you knock computer keyboard in the dark? Do you want to get a special keyboard with light? Please have a look at this 2.4G Wireless Keyboard! You now can bring this 2.4G Wireless Keyboard to where you are most comfortable without any angle or direction limits. This mini wireless keyboard is ideal for living room multimedia PCs, conference rooms, mobile, workgroup project environments and modern office environments. The wireless keyboard features 2.4GHz RF connectivity and an ultra-slim, ultra-stylish design with clean lines. You are not to be bored by the mess keyboard cable anymore.




    KeyFolio K39336US Keyboard

    KeyFolio K39336US Keyboard

    The Kensington KeyFolio Bluetooth keyboard case is easy to set-up with tactile rubberized and spill-proof keys. The durable case protects the edges of your iPad from wear and scratches and includes a camera opening for FaceTime use. An adjustable stand offers multiple positions for viewing in landscape mode and the compact, lightweight design is optimized for travel.




    Mini portable LED projector with charger

    Mini portable LED projector with charger

    This is a very cheap portable projector with charger, The projector supported many AUDIO and video formats, having the earphone connector and AV,USB connector.




    Portable Mini Projector H8000

    Portable Mini Projector H8000

    The new H8000 projector using DLP display technology, make the image more realistic nature. For you to create full computing power of a strong integrated business and entertainment mobile platform. Can be connected to computers, mobile phones, MP4, game console and other external devices, running a large-screen viewing effect.




    Portable Telescopic Projector Tripod

    Portable Telescopic Projector Tripod

    Perfect for photographers on the run. The Digital Projector Tripod is designed for most film and digital Projectors as well as camcorders. Lightweight, versatile, and affordable, the Digital Projector Tripod is a great tripod for photographers of all levels of experience. Made of high quality of Steel material, this Telescopic Projector Tripod will make your Projector support system more stable and versatile than ever.


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    BATTERIES, CHARGERS AND POWER SOLUTIONS FOR COMPUTERS, CELLPHONES AND OTHER DEVICES

    Some product examples good stores where you can find power solutions for information technology equipment. By going through these links you can find many more products in the same categories:

    New 6cell 5200mAH Battery for ASUS PC 1015PE 1015PEB1015PED 1015PEG 1015PEM1015PN

    New 6cell 5200mAH Battery for ASUS PC 1015PE 1015PEB1015PED 1015PEG 1015PEM1015PN

    It is 6cell 5200mAH Battery for ASUS PC 1015PE 1015PEB1015PED 1015PEG 1015PEM1015PN, Its Compatible Part Numbers:A31-1015 AL31-1015 A32-1015 PL32-1015, and Its Compatible Models is For ASUS Eee PC 1015 Series Eee PC 1015P Eee PC 1015PE Eee PC 1016 Series Eee PC 1016P Eee PC 1215 Series.




    Laptop AC Power Supply Adapter for ASUS Eee PC Series

    Laptop AC Power Supply Adapter for ASUS Eee PC Series

    This is a Laptop Power Supply Adapter. Made of high quality material, designed to quickly and safely. The Power Supply Adapter is high efficiency and reliability. The unique design allows you to easily pack the Power Supply Adapter along with your laptop. As a convenient back-up power source is perfect choice. You can use the adapter around the world for business or travel.




    Portable Emergency Mobile Solar Power Charger 12000mAh for MP3 Cell phone iPod iPhone Laptop(Black)

    Portable Emergency Mobile Solar Power Charger 12000mAh for MP3 Cell phone iPod iPhone Laptop(Black)

    ? General Product Name Portable Mobile Solar Power Charger Brand/Model NA Color Black Basic Specification Battery Type Lithium Battery Capacity 12000MAH Solar Panel 17V/300mA Output Voltage 5V,5.5V,6V/9V,11.1V,16V,19V Charger Time Around 2 hours Charging Mode USB or Adapter Dimension(L x W x H) 250 x 100 x 35 mm Suitable For iPhone/iPad/PDA/PSP/MP3/Mp4/Laptop/Notebook Features Portable mobile charger for your item Easy to take and charge conveniently LED lights flash when charging the mobile. Package Included 1 x Portable Mobile Charger 3 x Cables 1 x AC Adapter 5 x Adapters for cell phone 8 x Adapters for laptop ?Note: If you want to know more information, please browse this video as follow: ?




    5200mah Replacement Laptop Battery for Lenovo Y450 Y450A Y550 L08O6D 6cell - Black

    5200mah Replacement Laptop Battery for Lenovo Y450 Y450A Y550 L08O6D 6cell - Black

    Compatible Brand: LenovoCompatible Laptop Models: Lenovo: IdeaPad Y450, IdeaPad Y450 20020, IdeaPad Y450 4189, IdeaPad Y450A, IdeaPad Y450G, IdeaPad Y550, IdeaPad Y550 4186, IdeaPad Y550A, IdeaPad Y550P, IdeaPad Y550P 3241Compatible Part Numbers: Lenovo: 55Y2054, L08L6D13, L08O6D13, L08S6D13Cell type: Li-ionCapacity (mAh): 5200Capacity Range (mAh): 5000-7000Voltage (v): 11.1Dimension (cm): 20.85.32Color: BlackShipping Weight(Kg): 0.318>




    AC Adapter Charger Power Supply for Dell (90w, 19.5V, 4.62A)

    AC Adapter Charger Power Supply for Dell (90w, 19.5V, 4.62A)

    Weight (kg): 0.255




    Battery Charger for Li-ion Ni-MH Ni-Cd Battery Black

    Battery Charger for Li-ion Ni-MH Ni-Cd Battery Black

    Compatible Battery: Li-ion Ni-MH Ni-CdCharging Battery Quantity: 2Input Voltage (V): AC 110-240VOutput Voltage (V): 4.2VDimensions (cm): 13.0 x 7.0 x 3.5Weight (kg): 0.099>




    Lenovo Lithium Ion Notebook Battery Lithium Ion LiIon 5.2Ah 10.8V DC 40Y6799

    Lenovo Lithium Ion Notebook Battery Lithium Ion LiIon 5.2Ah 10.8V DC 40Y6799

    Stay unplugged longer with the help of a spare ThinkPad system battery. Help increase your productivity by achieving longer system run times than with just the standard system battery. Get the power you need whenever and wherever you need it for your ThinkPad T60 or R60 Series notebook.




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    ELECTRONIC KITS AND COMPONENTS

    By clicking at this link, you will find all types of electronic components for hobby use and for professional use in laboratories. You will find electronic sets that can be used to build a lot of sevices and circuits. There are kits for building or installing specific electronic devices like power supplies, wave and pulse generators, measure devices, detectors, alarms, light effect generators, radio resceivers and transmitters and a lot more.  You will also find specific components of every kind singly or in bulk.

     

    Electronics Kits and components - please click here

     

    You will find electronic components or material of every sort in bulk or single: NTE electronic parts, capasitators, dials, knobs, diodes, relays, resistors, potetiomenters, semiconductors of every kind, transistors, diodes, thyristors, speaker wires, trimmers, hook up wire, wire ties, Heat Shrinkable Tubing - Thin Wall Polyoefin -2:1 Per Package-48in, Heat Shrinkable Tubing - Thin Wall Polyoefin -2:1 Per Package-6in, Heat Shrinkable Tubing - Dual Wall Polyoefin w/Adhesive-3:1 Per Package-6in.

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    DATA STORE MEDIA EXPLANAINED

    CD-ROM

    This is a round disk to store data on that is set into a station on the computer when it is to be used.

    Data are written and read optically, using a laser beam.

    The basic technology is the same as in music and play CDs.  However, a CD-rom must have a higher reliability that a music CD. Therefore much of the place in the CD-rom is used to store the information extra times, so that a fault do not detroy the ability to read data. Therefore a CD-rom generally has lower practical store capacity than a music CD.

    The data is stored as small holes in a very thic metallic sheet on the disk. A traditional practical store capasity is 700 MB (mega-bytes), that is 700 million figures or letters. Now there are CD-ROMs with a capacity of 1 GB (giga-bytes), that is a billion figures or siffers.

    A standard computer usually has a CD-reader (CD-station) and may also have a CD-burner used to store data on CDs. Once an area on a CD has been written on, it cannot be arased and rewritten.

    However, written areas can be marked as invalid so that it is not read any more. When one commands a file to be erased on a CD, this is actually done.  Updated versions of the data can then be rewritten on another area on the CD. Both these operations are usually done when one commands a restore of a file on the CD-rom. 

    In this way a CD can be used to store data, update the same data with new versions, and mark old versions of data as invalid.

    Data is usually updated by storing a file a second time, and then the old version of the file is marked as invalid, but remains technically on the cd. Because updasting files and writing new files allways use new areas on the CD, each write an dupdate will consume some of the CD, and it vill eventually get filled up.

     

    DVD-DISC

    Also a DVD-disc is a round disk to be store data at, that is to set into a station on the computer when it is to be used.

     Data are written and read optically, using a laser beam.

    A DVD-disk is made up with the same basic technology as CD-roms. However the fromat of data stored is different. An important difference is that the disk contain less place-consuming techiques to detect and correct faults in the data than a CD-rom. Therefor a DVD can contain practically greater amount of data than a CD-rom, but the data may contain errors, and a DVD can therefore only be used in applications where such errors do bot have great consequences.

    A standard DVD generally stores 4.7 GB (gigabytes) of data if it is single-layered and 8.5 gigabytes when double-layered.

    Data is not stored doubly and the security mechanisms to detect faults are less

    A DVD-disc can be a read only, called DVD-rom or a read-write disc.  DVD-roms include replicated (factory pressed), recorded (burned), video, audio, and data DVDs.

    As with CD-roms, areas on a DVD can only be witten once, but written areas can be marked as invalid, and the same files can be updated on another area. Thus files on a DVD can be written and updated many times, but each time some of the DVD is consumed.

    There are severl DVD-formats: DVD-video for video footages, DVD-audio for sound-tracs and DVD-data to store data on.

    The term DVD is also applied generically in describing newer video disc formats, Blu-ray Disc and HD DVD.

     

    HD-DVD

    Also a HD-DVD-disc is a round disk to be store data at, that is to set into a station on the computer when it is to be used. Data are written and read optically, using a laser beam.

    HD-DVD is meant to be the successor of standard DVDs with a much higher data density.

    HD-DVD can be found in read-only verions used for commersial music, videos and plays, and as read-write versions.

    As with CD-roms and DVDs, areas on a HD-DVD can only be witten once, but written areas can be marked as invalid, and the same files can be updated on another area. Thus files on a HD-DVD can be written and updated many times, but each time some of the HD-DVD is consumed.

    As with DVDs, the disc can be formated for several formats suited for Video, Audio or Data files.

    HD-DVD disks are found in these versions_

    12 cm, single sided 15 GB 30 GB
    12 cm, double sided 30 GB 60 GB
    8 cm, single sided 4.7 GB 9.4 GB
    8 cm, double sided 9.4 GB 18.8 GB

     

    BLU-Ray

    Also a BLU-ray-disc is a round disk to be store data at, that is to set into a station on the computer when it is to be used. Data are written and read optically, using a laser beam.

    A standard BLU-ray generally stores 25 or 50 GB (gigabytes) of data if it is single-layered and 50 or 100 gigabytes when double-layered.

    As with CD-roms, areas on a DVD can only be witten once, but written areas can be marked as invalid, and the same files can be updated on another area. Thus files on a DVD can be written and updated many times, but each time some of the DVD is consumed.

    Blu-ray technology uses a blu-violet laser bem to store and read data. This light has a much shorter wave-length that that of the red laser ligh used on CD-roms and DVDs. Therefore a much higher desity of data is possible.

    Blu-ray disks are found in these versions_

    12 cm, single sided 25 GB or 50 GB
    12 cm, double sided 50 GB or 100 GB
    8 cm, single sided 7.8 GB or 15.6 GB
    8 cm, double sided 15.6 GB or 31.2 GB

     

    Flash memory cards and some other memory card types

    Flash memory are based on semiconductor chips. On these chips there are transistors that can be made conducting or insulating by charging or decharging a port on the transistor. A transistor being conducting or insulating stores information bits. The charged ports are shielded in such a way that they can hold their charge in many years. Therefore the chips can hold information also when they are not connected to a source of charge.

    In advanced flash memory cards, the chrarged port can hold several charge levels, and thus store emore than just one bit.

    Flash chips are a type of  EEPROMs. They are however different from other EEPROMS by not being erased or writen one byte at a time. A  whole block on the card must be written at a time. By data update, a whole block must be both erased and rewritten. 

    The chip is integrated into a card that is set in a slot in the computer, telephone or other devices. These slots are physically standardized and with standardized hardwere.

    Flash chips can have from a few kilobits to  2 GB (gigabits) of data stored, and more than one chip can be integrated in one card. 

    Flash memory cards are available in different speeds such as 2 MB per second, 12 MB per second, etc.

    Flash memories are often combined with special file systems that optimally use the charcteristics of flash memory reding, erasing and writing. Examples of file systems used are FTL and FlashXC for PCs and JFFS, JFFS2 and JAFFS for Linux. The standards differ according to the size and shape of the card, the hardwere used to connect the computer to the card, and the file system used for this connection.

    Here is a list of memory card standards used in different devices

     

    Name Acronym Form factor DRM
    PC Card PCMCIA 85.6 × 54 × 3.3 mm None
    CompactFlash I CF-I 43 × 36 × 3.3 mm None
    CompactFlash II CF-II 43 × 36 × 5.5 mm None
    SmartMedia SM / SMC 45 × 37 × 0.76 mm None
    Memory Stick MS 50.0 × 21.5 × 2.8 mm MagicGate
    Memory Stick Duo MSD 31.0 × 20.0 × 1.6 mm MagicGate
    Memory Stick Micro M2 M2 15.0 × 12.5 × 1.2 mm MagicGate
    Multimedia Card MMC 32 × 24 × 1.5 mm None
    Reduced Size Multimedia Card RS-MMC 16 × 24 × 1.5 mm None
    MMCmicro Card MMCmicro 12 × 14 × 1.1 mm None
    Secure Digital Card SD 32 × 24 × 2.1 mm CPRM
    miniSD Card miniSD 21.5 × 20 × 1.4 mm CPRM
    microSD Card microSD 11 × 15 × 1 mm CPRM
    xD-Picture Card xD 20 × 25 × 1.7 mm None
    Intelligent Stick iStick 24 x 18 x 2.8 mm None
    Serial Flash Module SFM 45 x 15 mm None
    µ card µcard 32 x 24 x 1 mm Unknown
    NT Card NT NT+ 44 x 24 x 2.5 mm None


    (The table is fetched from wikipedia.org, and it is therefore free to copy and reuse)

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