D drive not available to mount

You don't have anything in "Places" that looks like this harddrive? It should appear there.

Can you give the output of:

sudo fdisk -l; mount

Thanks

contents of fdisk-l; mount

Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe1327553

   Device Boot Start End Blocks Id System
/dev/sda1 1 192 1536000 27 Unknown
Partition 1 does not end on cylinder boundary.
/dev/sda2 * 192 5419 41984000 7 HPFS/NTFS
/dev/sda3 5419 9370 31742477+ f W95 Ext'd (LBA)
/dev/sda4 9371 19458 81024000 83 Linux
/dev/sda5 5419 9309 31250000 7 HPFS/NTFS
/dev/sda6 9310 9370 489951 82 Linux swap / Solaris

Disk /dev/sdb: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000d96ab

   Device Boot Start End Blocks Id System
/dev/sdb1 1 18693 150145024 83 Linux
/dev/sdb2 18693 19458 6142977 5 Extended
/dev/sdb5 18693 19458 6142976 82 Linux swap / Solaris
/dev/sdb1 on / type ext4 (rw,errors=remount-ro,commit=600)
proc on /proc type proc (rw,noexec,nosuid,nodev)
none on /sys type sysfs (rw,noexec,nosuid,nodev)
fusectl on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
none on /dev type devtmpfs (rw,mode=0755)
none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
none on /dev/shm type tmpfs (rw,nosuid,nodev)
none on /var/run type tmpfs (rw,nosuid,mode=0755)
none on /var/lock type tmpfs (rw,noexec,nosuid,nodev)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfs-fuse-daemon on /home/justin/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=justin)
/dev/sda5 on /media/Data type fuseblk (rw,nosuid,nodev,allow_other,blksize=4096,default_permissions)
/dev/sda2 on /media/Vista type fuseblk (rw,nosuid,nodev,allow_other,blksize=4096,default_permissions)
/dev/sda4 on /media/b07bd38d-a5ac-41a2-a0fa-1462e308a1bb type ext3 (rw,nosuid,nodev,uhelper=udisks)

Please tell me I haven't put the 32 bit 10.10 on the second hard drive and erased everything on it!

Ta Fz

I'm guessing by "D drive" you mean sdb...

Disk /dev/sdb: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000d96ab

   Device Boot Start End Blocks Id System
/dev/sdb1 1 18693 150145024 83 Linux
/dev/sdb2 18693 19458 6142977 5 Extended
/dev/sdb5 18693 19458 6142976 82 Linux swap / Solaris

Appears to be a linux based drive:

/dev/sdb1 on / type ext4 (rw,errors=remount-ro,commit=600)

I couldn't comment on the arch of the install, unless you are booted to sdb, in which case you can run:

uname -m

i686 == 32bit
x86_64 == 64bit

You can check the release with:

lsb_release -c

HTH