Mysterious drive capacity numbers....?
Karl Auer
kauer at biplane.com.au
Tue Dec 14 08:44:39 UTC 2010
Hi all.
I have a conundrum.
here are lines from "mount" and "df -k" showing a connected USB hard
disk:
/dev/sdb1 on /media/nc1 type ext3 (rw,nosuid,nodev,uhelper=hal)
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sdb1 961432072 57820632 854773440 7% /media/nc1
Note that the amount used is given as 57,820,632K - about 57GB.
But 961 - 854 = 107. Where did the extra 50GB go?
I thought it could possibly be the blocking factor at work - but the
lion's share if the data on that drive is large files - ISO images, VMs
and so forth.
Also, the above numbers are a snapshot from an ongoing backup. The 50GB
difference has remained constant for some time. Unfortunately I did not
look at the drive capacities when it was freshly formatted - I suppose
there could be 50GB of bad blocks...
My current guess/hope is that it is formatting overhead, though 50GB
seems a bit excessive.
Can anyone throw light? Or point me to a good tool for looking at the
drive (non-destructively)...?
Regards, K.
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au) +61-2-64957160 (h)
http://www.biplane.com.au/kauer/ +61-428-957160 (mob)
GPG fingerprint: DA41 51B1 1481 16E1 F7E2 B2E9 3007 14ED 5736 F687
Old fingerprint: B386 7819 B227 2961 8301 C5A9 2EBC 754B CD97 0156
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