Linux in a Nutshell, 6th Edition

Name

fstest

Synopsis

fstest

Toggle the filesystem test mode, which prints data for device reads and the values being sent to the low-level routines. The install and testload commands turn off filesystem test mode. The test output is in the following format:

<partition-offset-sector, byte-offset, byte-length>

for high-level reads in a partition, and:

[disk-offset-sector]

for low-level sector requests from the disk.