/dev/hda5 already mounted or /mnt/FC3 busy.--?

[John Cox]

I have FC3 on hda5 as a LogVol. I just installed ubuntu on hda2 to
check it out and tried to mount my FC partition (hda5) with "mount -t
ext3 /dev/hda5 /mnt/FC3" and I get "/dev/hda5 already mounted or
/mnt/FC3 busy." As far as I can tell neither is true. Can someone tell
me what might be causing this?

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/hda1   *      0+  18280-  18281-   9213246    7  HPFS/NTFS
/dev/hda2      18281   32511   14231    7172424   83  Linux
/dev/hda3      32512+  32719-    208-    104422+  83  Linux
/dev/hda4      32719+  77519   44801-  22579326+   f  W95 Ext'd (LBA)
/dev/hda5      32719+  77519   44801-  22579326   8e  Linux LVM

John