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A flash memory format introduced in 1994 by SanDisk. At approximately 36x43x3mm, CompactFlash (CF) cards are much larger than the SD cards used in most cameras; however, they are still used in digital SLRs, and many photographers find the larger size harder to misplace. CompactFlash supports both 3.3v and 5v circuits and can hold up to 512GB as of 2020.

Data transfer speeds are designated as multiples of the first CD-ROM rate of 150 KB/sec. For example, 1,000x = 150 MB/sec. See CD-ROM drives.

CF Cards Use the PC Card Interface
Type I CF cards are 3.3mm thick and commonly used for camera storage. Type II cards are 5mm thick and were previously used for miniature hard drives, modems and Ethernet. On earlier laptops, adapters enabled the 50-pin Type II CF card to plug into the 68-pin PC Card slot. See Microdrive and PC Card.

CompactFlash Module
CompactFlash modules are still used in digital SLR cameras with capacities up to 512GB. For form factor comparisons, see memory card.
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References in periodicals archive ?
SanDisk MEA will be presenting its innovative retail range for 2011 at DCC MEA, which includes the SanDisk Ultra USB drive, SanDisk Cruzer Edge USB drive and the San-Disk Extreme Pro CompactFlash card features 128 gigabytes (GB)1 of storage and up to 100 megabyte per second (MB/sec) write speeds.
SanDisk Corporation (NASDAQ:SNDK), a provider of flash memory cards, has launched its new high-capacity CompactFlash card, the company announced yesterday.
Similar in size to a CompactFlash card, the new specifications' access control function and highly durable form factor produce a combination of physical ruggedness and reliability that is indispensable for professional usage models.
The system will accept any storage capacity size Type I CompactFlash card. It also features the ability to record digital still images and MPEG2 or MPEG1 video either on its internal 64MB flash memory or on removable CF cards.
The system streams the data direct to a CompactFlash card and is operated by a Windows Mobile-based remote control unit via BlueTooth.
Users can download label formats, graphics and databases to the printer's Flash Memory (or a CompactFlash Card), disconnect the printer from the PC, plug in a standard PC keyboard, and take the printer to another location.
Much of their share of the market comes from the drop in CompactFlash card sales.
We have PCMCIA slots or CompactFlash card slots as options.
Included is 32 MB of built in memory and an expandable CompactFlash card slot for more storage.
2.1 and provides up to 1.8-GHz Pentium[R] M CPU support, 512-MB SDRAM, 40G HDD, a hot-swappable CompactFlash card, USB 2.0 ports, and gigabit Ethernet.