Hello Jan, thanks for your time and sorry for partly wasting it.
[email protected] (Jan Stary), 2012.09.11 (Tue) 14:27 (CEST): > On Sep 11 12:48:40, MERIGHI Marcus wrote: > > Hello, > > > > I did a complete deletion of all partitions of an external usb hd by > > means of diskmgmt.msc under windows, followed by partitioning and > > formating to msdos fat32 with kind help of acronis true image since > > windows xp does not do such things natively. > > > > Very unexpectedly (to me) under OpenBSD the fdisk output (see below) > > reflects the new layout, but disklabel output (see below) shows the old > > partition size. > > What "old size"? sorry, I did not provide full history and context: 1) the disk was in use before, partitioned 500GB/200GB msdos/ffs. 2) to have a duid, a ran disklabel on it. (that's the disklabel I was suprised to find after the following steps, the duid was still the same) 3) found I needed 700GB msdos 4) backed up data on another disk 5) repartioning and reformating as described in my initial message 6) restore backed up data, 200GB remained free. > You repartitioned the disk under windows. > So now it has no real BSD label. What does The other way 'round, it does have one, to my surprise. > disklabel do with such disks? The sensible thing: > > Note that when a disk has no real BSD disklabel, the kernel creates > a default label so that the disk can be used. This default label will Do you really think I did not read that, though I was referring to disklabel(5) even in the subject line? > And that's exactly what happened: > > > Disk: sd1 geometry: 91201/255/63 [1465149168 Sectors] > > Offset: 0 Signature: 0xAA55 > > Starting Ending LBA Info: > > #: id C H S - C H S [ start: size ] > > ------------------------------------------------------------------------------- > > *0: 0C 0 32 33 - 91201 52 51 [ 2048: 1465145344 ] Win95 > > FAT32L > > 1: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused > > > > 2: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused > > > > 3: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused > > > disklabel recognized the fdisk DOS partition Correctly, the full 700GB of that disk. > and created a default disklabel for that: Wrong. > > # /dev/rsd1c: > > type: SCSI > > disk: SCSI disk > > label: holmer-medien-01 > > duid: 94f3e0ef639263f9 > > flags: > > bytes/sector: 512 > > sectors/track: 63 > > tracks/cylinder: 255 > > sectors/cylinder: 16065 > > cylinders: 91201 > > total sectors: 1465149168 > > boundstart: 0 > > boundend: 1465149168 > > drivedata: 0 > > > > 16 partitions: > > # size offset fstype [fsize bsize cpg] > > c: 1465149168 0 unused > > i: 1048576000 2048 MSDOS # If you were right, ``i'' would be the full size, as in the fdisk output, not just 500GB. Meanwhile I've tested ``D'' in disklabel editor; after that the correct size is reported. Did not dare to save the disklabel, though. Still hoping for a "go ahead, that's the right thing to do". And an explanation of how the disklabel could survive, but that's optional :-) Thanks and good night, Marcus > !DSPAM:504f2f5b153932021786788!
