Re: FAT32?

[Chris Pressey <cpressey@xxxxxxxxxxxxxxx>]

On Fri, 23 Jul 2004 17:57:28 +0200
"M. Schatzl" <lists@xxxxxxxxxxxxxxx> wrote:

> Adonijah wrote:
> > Simon 'corecode' Schubert wrote:
> > 
> >> On 22.07.2004, at 02:27, M. Schatzl wrote:
> >>
> >>> I encountered strange behaviour related to FAT32-partitions. Since
> >I >> have 3 IDE's in the box, the mount-command would be (see fdisk
> >output >> at the end of the message):
> >>>  mount_msdos /dev/ad2s4 /mnt
> >>>
> >>> This fails with an "mount_msdos /dev/ad2s4: Invalid argument".
> >Same >> error if i append a "c" at the end. This machine has another
> >FAT32 >> partition on the first disk. Exactly the same here.
> >>
> >>
> >> [snipsnap]
> >>
> >>> ******* Working on device /dev/ad2 *******
> >>> parameters extracted from in-core disklabel are:
> >>> cylinders=159560 heads=16 sectors/track=63 (1008 blks/cyl)
> >>>
> >>> Figures below won't work with BIOS for partitions not in cyl 1
> >>> parameters to be used for BIOS calculations are:
> >>> cylinders=159560 heads=16 sectors/track=63 (1008 blks/cyl)
> >>>
> >>> Media sector size is 512
> >>> Warning: BIOS sector numbering starts with sector 1
> >>> Information from DOS bootblock is:
> >>> The data for partition 1 is:
> >>> sysid 131,(Linux filesystem)
> >>>     start 63, size 97713 (47 Meg), flag 80 (active)
> >>>         beg: cyl 0/ head 1/ sector 1;
> >>>         end: cyl 96/ head 15/ sector 63
> >>> The data for partition 2 is:
> >>> sysid 130,(Linux swap or Solaris x86)
> >>>     start 97776, size 2539152 (1239 Meg), flag 0
> >>>         beg: cyl 97/ head 0/ sector 1;
> >>>         end: cyl 1023/ head 15/ sector 63
> >>> The data for partition 3 is:
> >>> sysid 131,(Linux filesystem)
> >>>     start 2636928, size 5859504 (2861 Meg), flag 0
> >>>         beg: cyl 1023/ head 15/ sector 63;
> >>>         end: cyl 1023/ head 15/ sector 63
> >>> The data for partition 4 is:
> >>> sysid 5,(Extended DOS)
> >>>     start 8496432, size 152340048 (74384 Meg), flag 0
> >>>         beg: cyl 1023/ head 15/ sector 63;
> >>>         end: cyl 1023/ head 15/ sector 63
> >>
> >>
> >>
> >> this is not a FAT slice. it's a extended slice. the FAT slices are 
> >> *inside* of that. This reminds me of rewriting fdisk...
> >>
> >> you have to specify the simulated extended slice number 5 (at
> >least) > to access it, like chris already wrote: ad2s5/ad2s5c
> > 
> > 
> > Actually, I have an extended DOS partition and to access the logical
> > 
> > partition within I had to create as0s5, as06, ad0s7, ad0s8 and so
> > on. That worked, nothing else did.
> 
> A new world created obviously a lot of additional device nodes. But 
> even when I try looping over all ad2*-devices to get the ones which 
> mount without error, there is exactly no data on them. I verified the 
> existance of data on that disks several time with serveral systems. 
> Got to track this down a bit more.

I can't say I know what's going on here, but when your "empty" MSDOS
extended partition is mounted, what does 'df' say?  i.e. is it reporting
accurate figures for total size and % capacity of the filesystem?

-Chris