Compact Flash Primer
Much of the information below has been taken from the standards body ... http://www.compactflash.org/
CF Type I: "At 43mm (1.7") x 36mm (1.4") x 3.3mm (0.13"), the CF Type I card's thickness is less than one-half of a current PCMCIA Type II card. It is actually one-fourth the volume of a PCMCIA card. Compared to a 68-pin PCMCIA card, a CF card has 50 pins but still conforms to ATA specs. It can be easily slipped into a passive 68-pin PCMCIA Type II to CF Type I adapter that fully meets PCMCIA electrical and mechanical interface specifications."
CF Type II: "At 43mm (1.7") x 36mm (1.4") x 5mm (0.19"), the CF Type II card's thickness is equal to a current PCMCIA Type II card. It is actually less than one-half the volume of a PCMCIA card. Compared to a 68-pin PCMCIA card, a CF card has 50 pins but still conforms to ATA specs. It can be easily slipped into a passive 68-pin PCMCIA Type II to CF Type II adapter that fully meets PCMCIA electrical and mechanical interface specifications."
"The only difference between CF Type I and CF Type II cards is the card thickness. CF Type I is 3.3 mm thick and CF Type II cards are 5mm thick. A CF Type I card will operate in a CF Type I or CF Type II slot. A CF Type II card will only fit in a CF Type II slot. The electrical interfaces are identical. CompactFlash is available in both CF Type I and CF Type II cards, though predominantly in CF Type I cards. The Microdrive is a CF+ Type II card."
"CompactFlash cards are designed with flash technology, a nonvolatile storage solution that does not require a battery to retain data indefinitely. The CompactFlash card specification version 2.0 supports data rates up to 16MB/sec and capacities up to 137GB."
For clarification, Compact Flash is classified by 2 parameters, and they are easy enough to confuse ...
1. Formfactor = Type I / Type II
2. Interface = Specification 1.0 / 2.0 (8MB/s vs. 16MB/s)
"CompactFlash storage products are solid state, meaning they contain no moving parts, and provide users with much greater protection of their data than conventional magnetic disk drives. They are five to ten times more rugged (shock: 2,000 G = drop from 10 ft or 3 m) and more reliable than disk drives including CF+ Type II microdrives (175 G). CF cards consume only five percent of the power required by small disk drives. (i.e. microdrives)"
Much of the information below has been taken from the standards body ... http://www.compactflash.org/
CF Type I: "At 43mm (1.7") x 36mm (1.4") x 3.3mm (0.13"), the CF Type I card's thickness is less than one-half of a current PCMCIA Type II card. It is actually one-fourth the volume of a PCMCIA card. Compared to a 68-pin PCMCIA card, a CF card has 50 pins but still conforms to ATA specs. It can be easily slipped into a passive 68-pin PCMCIA Type II to CF Type I adapter that fully meets PCMCIA electrical and mechanical interface specifications."
CF Type II: "At 43mm (1.7") x 36mm (1.4") x 5mm (0.19"), the CF Type II card's thickness is equal to a current PCMCIA Type II card. It is actually less than one-half the volume of a PCMCIA card. Compared to a 68-pin PCMCIA card, a CF card has 50 pins but still conforms to ATA specs. It can be easily slipped into a passive 68-pin PCMCIA Type II to CF Type II adapter that fully meets PCMCIA electrical and mechanical interface specifications."
"The only difference between CF Type I and CF Type II cards is the card thickness. CF Type I is 3.3 mm thick and CF Type II cards are 5mm thick. A CF Type I card will operate in a CF Type I or CF Type II slot. A CF Type II card will only fit in a CF Type II slot. The electrical interfaces are identical. CompactFlash is available in both CF Type I and CF Type II cards, though predominantly in CF Type I cards. The Microdrive is a CF+ Type II card."
"CompactFlash cards are designed with flash technology, a nonvolatile storage solution that does not require a battery to retain data indefinitely. The CompactFlash card specification version 2.0 supports data rates up to 16MB/sec and capacities up to 137GB."
For clarification, Compact Flash is classified by 2 parameters, and they are easy enough to confuse ...
1. Formfactor = Type I / Type II
2. Interface = Specification 1.0 / 2.0 (8MB/s vs. 16MB/s)
"CompactFlash storage products are solid state, meaning they contain no moving parts, and provide users with much greater protection of their data than conventional magnetic disk drives. They are five to ten times more rugged (shock: 2,000 G = drop from 10 ft or 3 m) and more reliable than disk drives including CF+ Type II microdrives (175 G). CF cards consume only five percent of the power required by small disk drives. (i.e. microdrives)"
posted by Mingsheng at 7:22 AM
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