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Here
is a small comparison of Compact Flash (CF) Cards, Multimedia Cards (MMC),
and Secure Digital (SD) Cards. More will be added as new devices and
technologies are released. Note that all devices that support
Compact Flash cards, support CF Type I or Type II (unless specified).
| |
Compact
Flash |
Multimedia
Card |
Secure
Digital |
|
Devices |
Pocket PC Based
devices, Handera devices. |
Casio EM-500 |
Pocket PC Based
devices, Palm devices. |
| Current
Expansions |
Memory, Modem
(POTS and GSM), Networking (Ethernet, 10BaseT, and BNC), Wireless (RF),
GPS, Connectivity (Serial and USB), Data Input (Bar Code), Bluetooth,
802.11b |
Memory |
Memory, Bluetooth |
| Future
Expansions |
802.11a |
Modem, MP3
Player, Digital Still Camera, GPS, Bluetooth, Barcode scanner |
Modem, MP3
Player, Digital Still Camera, GPS, Barcode scanner |
Card Technical Specs (based off
SanDisk Memory Cards)
| |
CF
Type I |
CF
Type II |
Multimedia
Card |
Secure
Digital |
| Pins |
50 |
7 |
9 |
| Length |
36.4 mm |
36.4 mm |
32 mm |
| Width |
42.8 mm |
24 mm |
24 mm |
| Thickness |
3.3 mm |
5 mm |
1.4 mm |
2.1 mm |
| Weight |
11.4 mm |
13.5 mm |
1.5 g |
2 g |
| Voltage |
3V/5V Dynamic |
2.7-3.6V |
2.7-3.6V |
| Transfer
(Burst) |
Up to
20Mbytes/sec |
Up to 2.5Mbytes/sec |
Up to
2.5Mbytes/sec |
| Transfer
(Sustained) |
Approx.
1.4 Mbytes/sec |
|
|
| Sleep to Read |
2.0 msec |
1.0 msec |
1.0 msec |
| Sleep to Write |
2.5 msec |
1.0 msec |
1.0 msec |
| Current
Sizes |
Up to
512mb |
Up to 64mb |
Up to 128mb |
| Future
Sizes |
1gb
+ |
128mb + |
256mb + |
| Cost
for 32mb |
$18 |
$24 |
$30 |
| Cost
for 64mb |
$32 |
$43 |
$45 |
| Cost
for 128mb |
$53 |
(Not Available) |
$78 |
| Cost
for 256mb |
$103 |
(Not Available) |
(Not Available) |
* Some specs/info on SD cards is limited or not available.
Transfer rate for SD is based on number of data lines. 1 Data Line =
2.5mb/sec, 2 Data Lines = 6mb/sec, 4 Data Lines = 10mb/sec.
** Prices came from pricegrabber.com on April 2002 for SanDisk memory cards.
*** Specs for Transfer rates and power usage are maximum for top models.
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