[sf-lug] how to use fdisk to repartition a 1TB USB hard drive?
jim at well.com
Fri Jun 12 21:28:28 PDT 2009
i got a new 1TB USB stand-alone hard drive with a vfat
file system and called itself "My Book".
i figured i'd use fdisk to wipe the existing partition
table and make a new 100GB partition, leave the rest raw
and make new parts as i see the needs.
i used fdisk, which showed four screwy partitions and
then told me the device didn't seem to have a valid
partition table, maybe i screwed up.
i ignored fdisk's sarcasm and deleted the four screwy
partitions and then made a new 100GB partition. fdisk
partprobe didn't like things.
i rebooted. and then...
It still calls itself "My Book". I'd like to fix that
along with other things.
# fdisk -l Device Boot Start End Blocks
/dev/sdb1 1 121601 976760001 c W95
<JS: the above looks the way it came before i used
fdisk to wipe out the weird non-partitions that fdisk
complained about (along with a somewhat snide remark
that there was no partition table, i must have made
a mistake), and then create a single 100MB partition.>
# fdisk /dev/sdb1
Command (m for help): p
Disk /dev/sdb1: 1000.2 GB, 1000202241024 bytes
255 heads, 63 sectors/track, 121600 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x73696420
Device Boot Start End Blocks Id System
/dev/sdb1p1 1 123 987966 83 Linux
<JS: the above is what fdisk reports now, after i'd
used fdisk to make a 100 MB partition and rebooted
the whole system.>
# mount | grep sdb
/dev/sdb1 on /media/My Book type vfat
<JS: i would have tho't that blasting the old
partition table and creating a new one would have
blasted the stupid space-in-the-middle name, but
no: when the system reboots, it sees the drive as
it was originally, a vfat 1TB USB drive named
# cd /media/My*
# df -h .
Filesystem Size Used Avail Use% Mounted on
/dev/sdb1 932G 2.0G 930G 1% /media/My Book
<JS: and df sees the same old 1TB thing rather than
a nice new 100GB thing.>
<JS: so far, the internet has not revealed how to
repartition this thing:
Western Digital My Book 1 TB USB stand alone hard drive,
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