Re: libparted ped_disk_get_max_partition_geometry() gives wrong size

[Curtis Gedak]

On 11-06-15 02:13 AM, Jim Meyering wrote:
> ben wrote:
>
> > With libparted, version 2.3, I have been having a problem with
> > ped_disk_get_max_partition_geometry(). The function returns values that are
> > correct for the beginning of a partition but too small for the end. This only
> > seems to happen with MS-DOS disk labels. The returned value can be short by
> > over 2 megabytes and can even be *smaller* than the partition that already
> > exists there.
> >
> > I have seen the same behavior with disks of 40 GB too 1 TB and even flash
> > drives. GParted reports the correct sizes and often shows substantial
> > unallocated space after a partition that was supposed to be maximized.
> >
> > I am running Debian Linux.

Ben, this is just a thought, but perhaps the values you are seeing are 
due to cylinder alignment?

With today's large disk devices, one cylinder is about 8 megabytes in size.
(255 heads) * (63 sectors/track) * (512 bytes/sector) = 8,225,280 bytes.