hard disk geometry after using dban


New Member
my hdd geometry was:

Disk /dev/hdb: 20.4 GB, 20485785600 bytes
255 heads, 63 sectors/track, 2490 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

but after using dban 1.0.6 (quick method) fdisk says:

Disk /dev/hdb: 20.4 GB, 20485785600 bytes
16 heads, 63 sectors/track, 39693 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes

why...? bios has lba option selected.
i've checked fdisk command under knoppix versions 3.9 (kernel 2.6.11) and 3.6 (kernel 2.4.27) but it says the same.
dajhorn said:
Was the disk formatted by Microsoft Windows 95/98/Me prior to running DBAN on the computer?

yes. it had ntfs partitions formated under windows xp.

39693 cylinders - looks like chs mode, 2490 cylinders - lba mode...?
First, this does not indicate a problem.

Second, the geometry reported for large disks is usually a fiction.

Google for "INT13" if you want to learn more.