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After determining that the SD card supports it, the host device can also command the SD card to switch to a higher transfer speed. Until determining the card's capabilities, the host device should not use a clock speed faster than 400 kHz. SD cards other than SDIO (see below) have a "Default Speed" clock rate of 25 MHz.
The SD card as a WORM device has an essentially unlimited life. An OS such as Linux can then run from the live USB/SD card and use conventional media for writing, such as magnetic disks, to preserve system changes; see persistence (computer science).
In practice, the USB drive is a standard mass storage device, so it will also work on any modern operating system which can use such devices, including Windows XP, Vista and 7, Mac OS X and Linux. [5] The PC card drive, similarly, is a standard removable ATA device, so it also will typically function without any problems on modern operating ...
The MMC2IEC firmware provides emulation of the Commodore 1541 disk drive on the MMC2IEC adapter, providing access to a MMC memory card. The sd2iec firmware provides access to an SD card with a Commodore DOS-compatible interface on the SD2IEC adapter. It also supports many fast loaders, but it is not a Commodore 1541 disk drive emulation.
Memory card readers, unlike smartphones, telephones and other devices, such as cameras and digital cameras, allow formatting in a file system other than FAT (FAT16, FAT32, exFAT) to NTFS in Windows, ext, ext2, ext3 in Linux or HFS, HFS + for Mac OS. Smartphones or other devices like cameras format them only in FAT.
The Linux kernel has supported USB mass-storage devices since version 2.3.47 [3] (2001, backported to kernel 2.2.18 [4]).This support includes quirks and silicon/firmware bug workarounds as well as additional functionality for devices and controllers (vendor-enabled functions such as ATA command pass-through for ATA-USB bridges, used for S.M.A.R.T. or temperature monitoring, controlling the ...