So I recently installed Ubuntu 8.04 with windows XP. Ubuntu is on a second partition an the same hard drive as windows. The problem is that I lost a 400 gb SATA drive in Ubuntu. Windows recognizes it just fine though.

entering: cat /etc/mtab

produces:

/dev/sda5 / ext3 rw,relatime,errors=remount-ro 0 0
proc /proc proc rw,noexec,nosuid,nodev 0 0
/sys /sys sysfs rw,noexec,nosuid,nodev 0 0
varrun /var/run tmpfs rw,noexec,nosuid,nodev,mode=0755 0 0
varlock /var/lock tmpfs rw,noexec,nosuid,nodev,mode=1777 0 0
udev /dev tmpfs rw,mode=0755 0 0
devshm /dev/shm tmpfs rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
lrm /lib/modules/2.6.24-16-generic/volatile tmpfs rw 0 0
securityfs /sys/kernel/security securityfs rw 0 0
gvfs-fuse-daemon /home/andrew/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=andrew 0 0
/dev/sdb1 /media/Backup fuseblk rw,nosuid,nodev,noatime,allow_other,blksize=4096 0 0
-----------------------------------------------------------------

and entering: sudo fdisk -l

produces:

Disk /dev/sda: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x256bc023

Device Boot Start End Blocks Id System
/dev/sda1 * 1 5436 43664638+ 7 HPFS/NTFS
/dev/sda2 5437 14593 73553602+ 5 Extended
/dev/sda5 5437 14215 70517286 83 Linux
/dev/sda6 14216 14593 3036253+ 82 Linux swap / Solaris

Disk /dev/sdb: 200.0 GB, 200049647616 bytes
255 heads, 63 sectors/track, 24321 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xd7988960

Device Boot Start End Blocks Id System
/dev/sdb1 1 24321 195358401 7 HPFS/NTFS

-------------------------------------------------------------------

Ubuntu recognizes a external hard drive just fine, adding to my confusion.