Linux Disk Management

References

• See also page on NTFS and Samba

Partitions

Some CLI software:

• fdisk
• sfdisk
• parted

Some examples:

$ sudo fdisk -l /dev/sda                            # Show partition table for device /dev/sda
$ sudo fdisk -l -u /dev/sda                         # ... using sector as unit
$ sudo parted -l                                    # Show partition table of all devices
$ sudo parted /dev/sda print                        # ... of only device /dev/sda
$ sudo parted /dev/sda unit cyl print               #     ... using cylinder as unit
$ sudo parted /dev/sda unit s print                 #     ... using sector as unit (more accurate)
$ sudo sfdisk -l -uS /dev/sda                       # Show partition table for device /dev/sda
$ sudo sfdisk -d /dev/sda >sda-sfdisk.dump          # Dump partition in a format that can be understood by sfdisk
$ sudo sfdisk /dev/sda <sda-sfdisk.dump             # Restore a dumped partition table
$ sudo dd if=/dev/sda of=sda.mbr bs=512 count=1     # Save the complete MBR (table + boot code)

Use partprobe to force the kernel to re-read the MBR (re-read the partition table, see [1]). Or alternatively one can use fdisk to re-rewrite the same partition and force a re-read. And that are more solutions too ([2]):

$ sudo partprobe
# Or use fdisk
$ sudo fdisk /dev/sda
Command: v
Command: w
# Or use blockdev
$ sudo /sbin/blockdev --rereadpt /dev/hda
# Or use sfdisk
$ sudo sfdisk -R /dev/sda

Resizing Partitions

Reiserfs

1. Use resize_reiserfs to resize the partition, and get the new partition size

resize_reiserfs -s -4G /dev/sda6               #Must be unmount
df

2. Change the partition table

sudo sfdisk -d /dev/sda >sda-sfdisk.dump          # Edit sda-sfdisk.dump

3. Run reiserfsck

sudo reiserfsck --rebuild-sb
sudo reiserfsck --fix-fixable