The CompactFlash interface is a 50-pin subset of the 68-pin PCMCIA[13] connector. "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", according to compactflash.org.[14] The interface operates, depending on the state of a mode pin on power-up, as either a 16-bit PC Card (0x7FF address limit) or as an IDE (PATA) interface.[15]
Unlike the PC Card interface, no dedicated programming voltages (Vpp1 and Vpp2) are provided on the CompactFlash interface.[16]
CompactFlash IDE mode defines an interface that is smaller than, but electrically identical to, the ATA interface. The CF device contains an ATA controller and appears to the host device as if it were a hard disk. CF devices operate at 3.3 volts or 5 volts, and can be swapped from system to system. CompactFlash supports C-H-S and 28-bit logical block addressing (CF 5.0 introduced support for LBA-48). CF cards with flash memory are able to cope with extremely rapid changes in temperature. Industrial versions of flash memory cards can operate at a range of 45C to +85C.
NOR-based flash has lower density than newer NAND-based systems, and CompactFlash is therefore the physically largest of the three memory card formats introduced in the early 1990s, being derived from the JEIDA/PCMCIA Memory Card formats. The other two are Miniature Card (MiniCard) and SmartMedia (SSFDC). However, CF did switch to NAND type memory later. The IBM Microdrive format, later made by Hitachi, implements the CF Type II interface, but is a hard disk drive (HDD) as opposed to solid-state memory. Seagate also made CF HDDs.
CompactFlash IDE (ATA) emulation speed is usually specified in "x" ratings, e.g. 8x, 20x, 133x. This is the same system used for CD-ROMs and indicates the maximum transfer rate in the form of a multiplier based on the original audio CD data transfer rate, which is 150 kB/s.
where R = transfer rate, K = speed rating. For example, 133x rating means transfer speed of: 133150kB/s = 19,950kB/s 20MB/s.
These are manufacturer speed ratings. Actual transfer speed may be higher, or lower, than shown on the card[17] depending on several factors. The speed rating quoted is almost always the read speed, while write speed is often slower.
For reads, the onboard controller first powers up the memory chips from standby. Reads are usually in parallel, error correction is done on the data, then transferred through the interface 16 bits at a time. Error checking is required due to soft read errors. Writes require powerup from standby, wear leveling calculation, a block erase of the area to be written to, ECC calculation, write itself (an individual memory cell read takes around 100 ns, a write to the chip takes 1ms+ or 10,000 times longer).
Because the USB 2.0 interface is limited to 35 MB/s and lacks bus mastering hardware, USB 2.0 implementation results in slower access.
Modern UDMA-7 CompactFlash Cards provide data rates up to 145 MB/s[18] and require USB 3.0 data transfer rates.[19]
A direct motherboard connection is often limited to 33 MB/s because IDE to CF adapters lack high speed ATA (66 MB/s plus) cable support. Power on from sleep/off takes longer than power up from standby.
Many 1-inch (25mm) hard drives (often referred to by the trademarked name "Microdrive") typically spin at 3600 RPM, so rotational latency is a consideration, as is spin-up from standby or idle. Seagate's 8 GB ST68022CF drive[20] spins up fully within a few revolutions but current drawn can reach up to 350 milliamps and runs at 40-50 mA mean current. Its average seek time is 8 ms and can sustain 9 MB/s read and write, and has an interface speed of 33 MB/s. Hitachi's 4 GB Microdrive is 12 ms seek, sustained 6 MB/s.
The CF 5.0 Specification supports capacities up to 128 PiB using 48-bit logical block addressing (LBA).[21] Prior to 2006, CF drives using magnetic media offered the highest capacities (up to 8 GiB). Now there are solid-state cards with higher capacities (up to 512 GB).[22]
As of 2011, solid-state drives (SSDs) have supplanted both kinds of CF drive for large capacity requirements.
SanDisk announced its 16 GB Extreme III card at the photokina trade fair, in September, 2006.[23] That same month, Samsung announced 16, 32 and 64 GB CF cards.[24] Two years later, in September, 2008, PRETEC announced 100 GB cards.[25]
Seagate announced a 5 GB "1-inch hard drive" in June, 2004,[26] and an 8 GB version in June, 2005.[27]
In early 2008, the CFA demonstrated CompactFlash cards with a built in SATA interface.[28] Several companies make adapters that allow CF cards to be connected to PCI, PCMCIA, IDE and SATA connections,[29] allowing a CF card to act as a solid-state drive with virtually any operating system or BIOS, and even in a RAID configuration.
CF cards may perform the function of the master or slave drive on the IDE bus, but have issues sharing the bus. Moreover, late-model cards that provide DMA (using UDMA or MWDMA) may present problems when used through a passive adapter that does not support DMA.[30]
Original PC Card memory cards used an internal battery to maintain data when power was removed. The rated life of the battery was the only reliability issue. CompactFlash cards that use flash memory, like other flash-memory devices, are rated for a limited number of erase/write cycles for any "block." While NOR flash has higher endurance, ranging from 10,000 to 1,000,000, they haven't been adapted for memory card usage. Most mass storage usage flash are NAND based. As of 2015[update] NAND flash were being scaled down to 16nm. They are usually rated for 500 to 3,000 write/erase cycles per block before hard failure.[31] This is less reliable than magnetic media.[32] Car PC Hacks[33] suggests disabling the Windows swap file and using its Enhanced Write Filter (EWF) to eliminate unnecessary writes to flash memory.[34] Additionally, when formatting a flash-memory drive, the Quick Format method should be used, to write as little as possible to the device.
Most CompactFlash flash-memory devices limit wear on blocks by varying the physical location to which a block is written. This process is called wear leveling. When using CompactFlash in ATA mode to take the place of the hard disk drive, wear leveling becomes critical because low-numbered blocks contain tables whose contents change frequently. Current CompactFlash cards spread the wear-leveling across the entire drive. The more advanced CompactFlash cards will move data that rarely changes to ensure all blocks wear evenly.
NAND flash memory is prone to frequent soft read errors.[33] The CompactFlash card includes error checking and correcting (ECC) that detects the error and re-reads the block. The process is transparent to the user, although it may slow data access.
As a flash memory device is solid-state, it is less affected by shock than a spinning disk.
The possibility for electrical damage from upside-down insertion is prevented by asymmetrical side slots, assuming that the host device uses a suitable connector.
Small cards consume around 5% of the power required by small disk drives and still have reasonable transfer rates of over 45MB/s for the more expensive 'high-speed' cards.[35] However, the manufacturer's warning on the flash memory used for ReadyBoost indicates a current draw in excess of 500 mA.
CompactFlash cards for use in consumer devices are typically formatted as FAT12 (for media up to 16 MB), FAT16 (for media up to 2 GB, sometimes up to 4 GB) and FAT32 (for media larger than 2 GB). This lets the devices be read by personal computers but also suits the limited processing ability of some consumer devices such as cameras.
There are varying levels of compatibility among FAT32-compatible cameras, MP3 players, PDAs, and other devices. While any device that claims FAT32-capability should read and write to a FAT32-formatted card without problems, some devices are tripped up by cards larger than 2 GB that are completely unformatted, while others may take longer to apply a FAT32 format.
The way many digital cameras update the file system as they write to the card creates a FAT32 bottleneck. Writing to a FAT32-formatted card generally takes a little longer than writing to a FAT16-formatted card with similar performance capabilities. For instance, the Canon EOS 10D writes the same photo to a FAT16-formatted 2 GB CompactFlash card somewhat faster than to a same speed 4 GB FAT32-formatted CompactFlash card, although the memory chips in both cards have the same write speed specification.[36] Although FAT16 is more wasteful of disk space with its larger clusters, it works better with the write strategy that flash memory chips require.
The cards themselves can be formatted with any type of file system such as Ext, JFS, NTFS, or by one of the dedicated flash file systems. It can be divided into partitions as long as the host device can read them. CompactFlash cards are often used instead of hard drives in embedded systems, dumb terminals and various small form-factor PCs that are built for low noise output or power consumption. CompactFlash cards are often more readily available and smaller than purpose-built solid-state drives and often have faster seek times than hard drives.
When CompactFlash was first being standardized, even full-sized hard disks were rarely larger than 4 GB in size, and so the limitations of the ATA standard were considered acceptable. However, CF cards manufactured after the original Revision 1.0 specification are available in capacities up to 512 GB. While the current revision 6.0 works in [P]ATA mode, future revisions are expected to implement SATA mode.
CE-ATA is a serial MMC-compatible interface based on the MultiMediaCard standard.[39][40]
A variant of CompactFlash known as CFast is based on the Serial ATA (SATA) interface, rather than the Parallel ATA/IDE (PATA) bus for which all previous versions of CompactFlash are designed. CFast is also known as CompactFast.
CFast 1.0/1.1 supports a higher maximum transfer rate than current CompactFlash cards, using SATA 2.0 (300MB/s) interface, while PATA is limited to 167MB/s using UDMA 7.
CFast cards are not physically or electrically compatible with CompactFlash cards. However, since SATA can emulate the PATA command protocol, existing CompactFlash software drivers can be used, although writing new drivers to use AHCI instead of PATA emulation will almost always result in significant performance gains. CFast cards use a female 7-pin SATA data connector, and a female 17-pin power connector,[41] so an adaptor is required to connect CFast cards in place of standard SATA hard drives which use male connectors.
The first CFast cards reached the market in late 2009.[42] At CES 2009, Pretec showed a 32GB CFast card and announced that they should reach the market within a few months.[43] Delock began distributing CFast cards in 2010, offering several card readers with USB 3.0 and eSATAp (power over eSATA) ports to support CFast cards.
Seeking higher performance and still keeping a compact storage format, some of the earliest adoptors of CFast cards were in the gaming industry (used in slot machines), as a natural evolution from the by then well-established CF cards. Current gaming industry supporters of the format include both specialist gaming companies (e.g. Aristocrat Leisure) and OEMs such as Innocore (now part of Advantech Co., Ltd.).
The CFast 2.0 specification was released in the second quarter of 2012, updating the electrical interface to SATA 3.0 (600MB/s). As of 2014, the only product employing CFast 2.0 cards was the Arri Amira digital production camera,[44] allowing frame rates of up to 200 fps; a CFast 2.0 adapter for the Arri Alexa/XT camera was also released.[45]
On 7 April 2014, Blackmagic Design announced the URSA cinema camera, which records to CFast media.[46]
On 8 April 2015, Canon Inc. announced the XC10 video camera, which also makes use of CFast cards.[47] Blackmagic Design also announced that its URSA Mini will use CFast 2.0.[citation needed]
As of October 2016, there are a growing number of cameras, video recorders, and audio recorders that use the faster data rates offered by CFast media.
As of 2017, in the wider embedded electronics industry, transition from CF to CFast is still relatively slow, probably due to hardware cost considerations and some inertia (familiarity with CF) and because a significant part of the industry is satisfied with the lower performance provided by CF cards, thus having no reason to change. A strong incentive to change to CFast for embedded electronics companies using designs based on Intel PC architecture is the fact that Intel has removed native support for the (P)ATA interface a few design platforms ago and the older CPU/PCH generations now have end-of-life status.
In September 2016, the CompactFlash Association announced a new standard based on PCIe 3.0 and NVMe, CFexpress.[48] In April 2017, the version 1.0 of the CFexpress specification was published, with support for two PCIe 3.0 lanes in an XQD form-factor for up to 2 GB/s.[49]
The only physical difference between the two types is that Type I devices are 3.3mm thick while Type II devices are 5mm thick.[50] Electrically, the two interfaces are the same except that Type I devices are permitted to draw up to 70 mA supply current from the interface, while type II devices may draw up to 500 mA.
Most Type II devices are Microdrive devices (see below), other miniature hard drives, and adapters, such as a popular adapter that takes Secure Digital cards.[51][52] A few flash-based Type II devices were manufactured, but Type I cards are now available in capacities that exceed CF HDDs. Manufacturers of CompactFlash cards such as Sandisk, Toshiba, Alcotek and Hynix offer devices with Type I slots only. Some of the latest DSLR cameras, like the Nikon D800, have also dropped Type II support.[53]
Microdrive was a brand of tiny hard disksabout 25mm (1inch) widein a CompactFlash Type II package. The first was developed and released in 1999 by IBM, with a capacity of 170 MB. IBM sold its disk drive division, including the Microdrive trademark, to Hitachi in 2002. Comparable hard disks were also made by other vendors, such as Seagate and Sony. They were available in capacities of up to 8 GB but have been superseded by flash memory in cost, capacity, and reliability, and are no longer manufactured.[54]
As mechanical devices, CF HDDs drew more current than flash memory's 100 mA maximum. Early versions drew up to 500 mA, but more recent ones drew under 200 mA for reads and under 300 mA for writes. (Some devices used for high speedsuch as Readyboost, which had no low-power standby modeexceeded the 500 mA maximum of the Type II standard.) CF HDDs were also susceptible to damage from physical shock or temperature changes. However, CF HDDs had a longer lifespan of write cycles than early flash memories.
The iPod mini, Nokia N91, iriver H10 (5 or 6 GB model), PalmOne LifeDrive, and Rio Carbon used a Microdrive to store data.
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