[How To] Re-read The Partition Table Without Rebooting Linux System
The following commands can be run to achieve this:
# “partprobe” or “partprobe /dev/sda”
# “hdparm -z /dev/sda”
# “echo 1 > /sys/block/sda/device/rescan”
In case there are any errors reported, NFS or Samba services may be locking any files. In this case, you may try stopping these services then re-run the command(s).
On Gentoo, you may also run:
//you need to install the package first, by running "emerge rescan-scsi-bus"