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The SD Card is now the most
popular memory card format. It is a further
development of the MultiMediaCard and has additional functions such as data encryption and
a write protect switch.
The SD Card (32 x 24 x 2.1 mm) has the
same footprint as the MultiMediaCard (1.4 mm height) but is 0.7 mm thicker
and has 9 pins instead of 7 and a theoretical data rate which
is four times faster.
It uses the same flash technology as CompactFlash and PC Cards, but the data
is transferred serially rather than the
parallel data transfer used by the ATA protocol.
The memory media is the size of a postage stamp and the
cards are used both in industrial applications and in consumer
devices – especially as a memory
expansion for compact digital cameras or PDAs respectively
Pocket PCs.
A PC Card
Adapter which was developed by altec allows MultiMediaCards
to be used in any PC Card Type II slot, such as that found
in nearly all notebook PCs and altec Flash
Card drives.
The SD High Capacity Cards
with 4 and 8 GB capacity are not
downwards compatible to the existing SD Cards.
The new SDHC memory media fits into standard
SD Card slots but applications as card reader or digital
cameras explicitly need to be compatible with the cards.
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Available versions (with Item number)
256 MB SanDisk SD Card
EOL – Last Time Buy: April 24,
2008
altec Item no.: B20SD256JC
SanDisk Item no.: SDSDJ-256-J
512 MB SanDisk SD Card
altec Item no.: B20SD512JC
SanDisk Item no.: SDSDJ-512-J
1 GB SanDisk SD Card
altec Item no.: B20SD1024JC
SanDisk Item no.: SDSDJ-1024-J
2 GB SanDisk SD Card
altec Item no.: B20SD2048JC
SanDisk Item no.: SDSDJ-2048-J
4 GB SanDisk SDHC Card
altec Item no.: B20SD4096JC
SanDisk Item no.: SDSDJ-4096-J
8 GB SanDisk SDHC Card
altec Item no.: B20SD8192JC
SanDisk Item no.: SDSDJ-8192-J
The letter »B« added
in front of altec’s item number
marks RoHS compliant products.
The letter »-J« at
the end of the SanDisk’s item number indicates
bulk cards in Jewel Case.
above: SanDisk SD Card 2 GB
top right: SanDisk SD High Capacity
(SDHC) 8 GB |
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