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How to check and fix drive in OS X from CLI (diskutil, fsck_hfs)

##################
# using diskutil
##################

1. Verify disk info
01.png

Note: to check if partition is mounted
02.png

2. Check disk or volume
diskutil verifyDisk disk1
03.png

diskutil verifyVolume disk1s2
04.png

Note: target can simply be the root of the boot filesystem using a single forward-slash character.
ex)
diskutil verifyVolume "Macintosh HD"
diskutil verifyVolume Macintosh\ HD
diskutil verifyVolume disk0s2
diskutil verifyVolume /

##############
# using fsck
##############

To use fsck, simply run the following command
sudo fsck_hfs -f /dev/disk1s2
05.png

If problems do exist, then you can fix them
sudo fsck_hfs -fy /dev/disk1s2


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