Size Discrepancy between Parted and Qtparted.

[Matthew Johnson]

I am seeing a discrepancy I cannot explain between
the partitioning of one and the same disk and the
view of the partition table given by GNU Parted
and by qtparted. I am not sure whether this should
be reported to this list or not, but here seems to
be a good place to start.

The discrepancy is that after resizing the one and
only partition's file-system on /dev/sdc using
ntfsresize, and trying to movew the partition size
to match is (using qtparted), parted-1.6.25.1
reports a different starting point and a different
size for the partition.

Now I must admit that looking back, I see that I
resized the file-system by 40M when I meant to
resize by 40G, which certainly does not help the
situtation. But nevertheless, this error of mine
does not explain the discrepancies.

The discrepancies are:

1 - Parted reports that there is only one
partition, /dev/sdc1, while qtparted reports sdc1
and sdc-1 (weird name).

2 - Parted reports that that sole partition starts
at 32k and goes to 250G, while qtparted reports
that sdc1 starts at 32k and has size 232.85G.

Apparently qtparted really does mean 'Gigabytes'
by 'G', since 232.85 = 244155838/(1024*1024), so
that this matches up with what fdisk reports,
which is:

fdisk -l /dev/sdc (under Ubuntu) shows:
Disk /dev/sdc: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id
 System
/dev/sdc1               1       30396   244155838+   7
 HPFS/NTFS


Now here is the exact output of Parted-1.6.25.1:

using /dev/sdc
(parted) print
Disk geometry for /dev/sdc: 0kB - 250GB
Disk label type: msdos
Number  Start   End     Size    Type      File system 
Flags
1       32kB    250GB   250GB   primary   ntfs
(parted)

Rather than list the entire output from qtparted,
I will list the output from fdisk's 'x' menu,
which looks just as detailed. I hope you find this
helpful for understanding what is really going on
on this disk:

Disk /dev/sdc: 255 heads, 63 sectors, 30401 cylinders

Nr AF  Hd Sec  Cyl  Hd Sec  Cyl     Start      Size ID
 1 00   1   1    0 254  63 1023         63  488311677
07
 2 00   0   0    0   0   0    0          0          0
00
 3 00   0   0    0   0   0    0          0          0
00
 4 00   0   0    0   0   0    0          0          0
00


And here is the output from the more commonly used
fdisk option, 'fdisk -l':

fdisk -l /dev/sdc (under Ubuntu) shows:
Disk /dev/sdc: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id
 System
/dev/sdc1               1       30396   244155838+   7
 HPFS/NTFS

So please explain what parted has done here. Why
is it not showing the partition qtparted calls
'sdc1-1'? And why do the sizes differ?

I also tried 'parted unit s' followed by print, which
yields:

Using /dev/sdb
(parted) print
Disk geometry for /dev/sdb: 0kB - 250GB
Disk label type: msdos
Number  Start   End     Size    Type      File system 
Flags
1       32kB    250GB   250GB   primary   ntfs
(parted) unit s
(parted) print
Disk geometry for /dev/sdb: 0s - 488397167s
Disk label type: msdos
Number  Start   End     Size    Type      File system 
Flags
1       63s     488311739s 488311677s primary   ntfs
(parted)

So that the size now come out to 250,015,578,624
bytes. But this does not agree with the size
reported by fdisk or that reported by qtparted.



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