The CompactFlash standard received an upgrade in its revision 3, boosting the interface data transfer four-fold. The standard now integrates FAT32 to support the full capacity of cards over 2.2 GByte.
The newly announced CF+ and the CompactFlash Specification Revision 3.0 use Ultra DMA 33 and UltraDMA66 standard known from IDE harddrives to increase the interface data transfer rate from currently 16 MByte/s to 66 MByte/s. The DMA interface mode reduces the processor power required to manage the CompactFlash data transfers. Faster PCMCIA ATA Memory and I/O modes have also been added and can provide interface transfer rates up to 25 MByte/s, according to the standardization body CompactFlash Association (CFA).
Source: Tom’s Hardware Guide
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