The speed rating quoted is almost always the sequential read speed, while write speeds are often slower. Actual transfer speed may be higher, or lower, than shown on the card depending on several factors. Manufacturers are now placing the speed ratings on cards. For example, 133x rating means transfer speed of: 133 x. Where ‘S = transfer speed, ”K” = speed rating. This is the same system used for CD-ROM and indicates the maximum transfer rate in the form of a multiplier based on the original audio CD data transfer rate, which is 150 kByte/s. Usually page based mapping is used in the higher end cards.ĬompactFlash speed can be specified in “x” ratings, such as 8x, 20x, 133x. Ultra DMA capable, these cards are capable of very high data transfer rates, provided the controller mapping is efficient. The CF Interface is basically a Parallel ATA interface transferring 8 or 16 bit data in standard Memory and I/O modes or in TRUE IDE mode. Industrial CF cards can operate at a range of -40° to +85° C. CF cards with flash memory are able to cope with extremely rapid changes in temperature. CF 5.0 introduced support for LBA-48 addressing. CF (in TRUE IDE mode) supports cylinder-head-sector| (C-H-S) and 28-bit logical block addressing (LBA 28). CF devices must operate at 3.3 volts or 5 volts, and can be swapped from system to system. The CF device contains an Advanced Technology Attachment|ATA controller mode and appears to the host device as if it were a hard disk.
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“It can be easily slipped into a passive 68-pin PCMCIA Type II to CF Type I adapter.The interface operates, depending on the state of mode pin 9 on power-up, as either a 16-bit PC Card Memory or I/O mode card, or as an IDE/PATA Disk via TRUE IDE mode.ĬF IDE mode defines an interface that is Physically smaller than, but electrically identical to the PATA/IDE interface. The CompactFlash interface is a 50-pin subset of the 68-pin PCMCIA connector. The passive adapter takes care of grounding pin 9. When is TRUE IDE mode the CF card is not hot swappable. This mode is entered when the card has pin 9 grounded on the 50 pin connector when power is applied. This is because the CF card has a TRUE IDE mode, which allows the CF card to function exactly as a PATA/IDE drive. Hence the CF card can serve as a disk drive in a Legacy PC using the IDE interface. Since the CF card is based on the PATA/IDE interface, it can easily be put on an PATA/IDE disk interface, as a Master or Slave device. We now have CF 6.1, which introduces the fastest transfer speeds yet, using Ultra DMA 7 (UDMA 7)ĬF cards can be used directly in a PC card slot with a plug-in adapter, used as an ATA (IDE) or PCMCIA storage device with a passive adapter or with a reader. There are four main card speeds: original CF, CF High Speed (using CF+/CF2.0), faster CF 3.0 standard and the faster CF 4.0 standard adopted as of 2007.
The type II slot is used by miniature hard drives and in some specialty cameras, but is not as common. There are two main subdivisions of CF cards, 3.3 mm thick type I and 5 mm-thick type II (CF2).
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CFast (also known as CompactFast) is based on the Serial ATA (SATA) interface. Traditional CF cards use the Parallel ATA (PATA) interface, but in 2008, a variant of CompactFlash, CFast was announced. Formats such as MMC/SD memory cards are smaller than CF, while offering comparable capacity and speed. CompactFlash (CF) became the most successful of the early memory card formats, surpassing miniature and Smart media cards.
Industrial CF and SD cards are the most common Flash storage form factors in industrial applications.
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