On Wed, Jul 17, 2019 at 12:16:28PM +0200, Karel Zak wrote:
> On Thu, Jul 04, 2019 at 10:55:16PM +0100, Mike Fleetwood wrote:
> > Hi,
> >
> > This is a bit more of a speculative than my other recent one, but I saw
> > this quote in aix.c:
> > "All fdisk-like programs has to properly wipe the first sector.
> > Everything other is a bug."
> >
> > Using fdisk to create an MBR over the top of a whole disk FAT32 (and
> > probably FAT16) file system doesn't clear any of the FAT32 boot record
> > (aka super block). Blkid and wipefs report this as just an MBR, but
> > because the boot record is intact, GNU parted reports this still as a
> > whole disk FAT32 file system.
>
> This is bug. MBR probing code in fdisk is weak and it does not check for
> false positives like blkid, so FAT32 is interpreted as MBR and the bootbits
> are not wiped (fdisk wipes first sector only if it creates a new
> partition table).
Ah, I've forgot... it's fixed now :-)
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
