I got a new 500GB SSD and formatted it with ext4+LUKS using the Disks utility in Ubuntu 16.04.
- Enter disk with Nautilus, right-click and Properties. Total capacity is 492 GB, free space is 467 GB, and used space is 73 MB. Shouldn't Total = free + used?
df -H <mydisk>I get the same values as nautilus. Using
df -h <mydisk>I get total size 459GB, available 435GB, and used 70M. (Notice
-his powers of 1024, and
-His powers of 1000.)
500 * 10^9 / 2^30 = 465.66 GBmeaning the total size of 459GB makes sense when using powers of 1024. However, the discrepancy between total size and available+used space is still present.
Total size of the disk is quite different from the sum of the free and used amounts. Why? answer
This is a secondary disk. The OS is installed in a different disk.
$ sudo tune2fs -l /dev/sdb tune2fs 1.42.13 (17-May-2015) tune2fs: Bad magic number in super-block while trying to open /dev/sdb Couldn't find valid filesystem superblock. $ lsblk /dev/sdb NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sdb 8:16 0 465,8G 0 disk └─luks-<long-random-string-1> 253:3 0 465,8G 0 crypt /media/daniel/<long-random-string-2> $ sudo tune2fs -l /dev/mapper/luks-<long-random-string-1> <this works>
How do I recover the reserved space? (this doesn't work)
Edit: I've reduced the reserved space using
$ sudo tune2fs -m 0.3 /dev/mapper/luks-<long-random-string-1>. The problem was that I wasn't using the correct device (drive is encrypted).