Other File Systems
Because the host views the SD card as a block storage device, the card does not require MBR partitions or any specific file system. The card can be reformatted to use any file system the operating system supports. For example:
- Under Unix-like operating systems such as Linux or FreeBSD, SD cards can be formatted using the UFS, Ext2, Ext3, Ext4, btrfs, HFS Plus, or ReiserFS file system.
- Under Mac OS X, SD cards can be partitioned as GUID devices and formatted with the HFS Plus file system.
- Under Windows and some Unix systems, SD cards can be formatted using NTFS and, on later versions, exFAT.
Any recent version of the above can format SD cards using the UDF file system.
Additionally, an SD card called Live SD can contain an embedded operating system (such as Live USB). Computers that can bootstrap from an SD card (either using a USB adapter or inserted into the computer's flash media reader) instead of the hard disk drive may thereby be able to recover from a corrupted hard disk drive. A Live SD can be write-locked to preserve the system's integrity.
Read more about this topic: Secure Digital, Technical Details, File System
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