tldr/pages/linux/blockdev.md

blockdev

Manage, query, and manipulate block devices. More information: https://manned.org/blockdev.

• Print a report for all devices:

sudo blockdev --report

• Print a report for a specific device:

sudo blockdev --report {{/dev/sdXY}}

• Get the size of a device in 512-byte sectors:

sudo blockdev --getsz {{/dev/sdXY}}

• Set read-only:

sudo blockdev --setro {{/dev/sdXY}}

• Set read-write:

sudo blockdev --setrw {{/dev/sdXY}}

• Flush buffers:

sudo blockdev --flushbufs {{/dev/sdXY}}

• Get the physical block size:

sudo blockdev --getpbsz {{/dev/sdXY}}

• Set the read-ahead value to 128 sectors:

sudo blockdev --setra 128 {{/dev/sdXY}}