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(grub.info)fstest

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fstest
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 - Command: fstest
     Toggle filesystem test mode.  Filesystem test mode, when turned
     on, prints out data corresponding to all the device reads and what
     values are being sent to the low-level routines. The format is
     `<PARTITION-OFFSET-SECTOR, BYTE-OFFSET, BYTE-LENGTH>' for
     high-level reads inside a partition, and `[DISK-OFFSET-SECTOR]'
     for low-level sector requests from the disk.  Filesystem test mode
     is turned off by any use of the `install' (Note: install) or
     `testload' (Note: testload) commands.