blind Pete a écrit :
Pascal Terjan wrote:
On Fri, Jul 6, 2012 at 8:37 AM, blind Pete
<[email protected]> wrote:
David W. Hodgins wrote:
On Thu, 05 Jul 2012 05:10:30 -0400, blind Pete
<[email protected]> wrote:
Cfdisk is very unhappy about something.
FATAL ERROR: Bad primary partition 3: Partition begins after
end-of-disk Press any key to exit cfdisk
It looks like cfdisk's error message is wrong. Partition 3 is mounted
and in use.
Disk /dev/sda: 121601 cylinders, 255 heads, 63 sectors/track
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
Units = sectors of 512 bytes, counting from 0
121601x255x63=1953520065
CHS has not been reliable since zones were introduced decades ago.
They are just a general hint that it is a big drive. LBA or
sector number is all that matters. What happens inside the HDD
case is an unknowable mystery.
But cfdisk is still based on CHS (or was few years ago).
Ancient history:
Before the introduction of the ATA hard drive standard, in about 1990,
the normal way to address a sector was with a CHS tuple. With ATA
zone formatting became standard practice. There are fewer sectors in
a cylinder near the spindle than in a cylinder near the rim. The
Integrated Drive Electronics then "translated" the hidden real, but
variable, geometry into a pretend geometry with a constant number of
sectors per cylinder, so that existing operating systems like DOS and
possibly BIOSes would not fail miserably by being told that 1,1,20
does not exist, but 20,1,30 is fine.
Aligning things with physical cylinders was sometimes a good idea, but
now that information is hidden inside the drive. Aligning things with
pretend cylinders is pointless, because they probably don't correspond
to physical cylinders.
For example https://bugzilla.redhat.com/show_bug.cgi?id=630340#c1 says
that 2.18 (the one in mageia 1) expected the size of the device to be
a multiple of the cylinder size.
There was a bug in cfdisk two years ago. It seems to have been fixed.
Mageia 2's cfdisk does not complain about my hard drive.
Even if partition four were past the end of the disk it would not
excuse cfdisk for complaining about partition three.
Yes I don't know why it complains about 3 and not 4
The old version does some invalid maths - and gets the wrong answer.
Just a wild guess, but maybe cfdisk is using base 0 in the error message ?
i.e., starting with "partition 0" for the first partition, and saying
"partition 3" for the 4th
--
André
