Physical drive number to identify the target device. Always zero at single drive system.
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Return Values
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The current drive status is returned in combination of status flags described below. FatFs refers only STA_NOINIT and STA_PROTECT.
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STA_NOINIT
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Indicates that the device is not initialized. This flag is set on system reset, media removal or failure of disk_initialize() function. It is cleared on disk_initialize() function succeeded. Media change that occurs asynchronously must be captured and reflect it to the status flags, or auto-mount feature will not work correctly. If the system does not support media change detect feature, application program needs to force de-initialize the file system object with f_mount() function after the media change.
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STA_NODISK
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Indicates that no medium in the drive. This is always cleared on fixed disk drive. Note that FatFs does not refer this flag.
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STA_PROTECT
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Indicates that the medium is write protected. This is always cleared on the drives without write protect feature. Not valid if no medium in the drive.