[sf-lug] how to use fdisk to repartition a 1TB USB hard drive?

jim 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 
seemed happy. 
   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. 
        ubuntu 8.04, 
        # fdisk -l    Device Boot      Start         End      Blocks
        /dev/sdb1               1      121601   976760001    c  W95
        FAT32 (LBA)
        <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 
        "My Book".> 
        # 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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