Linuxでドライブ文字が足りない場合はどうなりますか？

、などに移動します/dev/sdaa。/dev/sdab/dev/sdac

ソースコードのコメントは次のとおりです。

/**
 *  sd_format_disk_name - format disk name
 *  @prefix: name prefix - ie. "sd" for SCSI disks
 *  @index: index of the disk to format name for
 *  @buf: output buffer
 *  @buflen: length of the output buffer
 *
 *  SCSI disk names starts at sda.  The 26th device is sdz and the
 *  27th is sdaa.  The last one for two lettered suffix is sdzz
 *  which is followed by sdaaa.
 *
 *  This is basically 26 base counting with one extra 'nil' entry
 *  at the beginning from the second digit on and can be
 *  determined using similar method as 26 base conversion with the
 *  index shifted -1 after each digit is computed.
 *
 *  CONTEXT:
 *  Don't care.
 *
 *  RETURNS:
 *  0 on success, -errno on failure.
 */

https://github.com/torvalds/linux/blob/master/drivers/scsi/sd.c#L3303-L3324