How do I unmount a HDD so I can format it (Initialize)?

[Tw4T]

Hi , I have two hard drives connected to my Duo, they are mounted as HDD and HDD2. I want to format HDD2 but when I go> Menu>Setup>System>Harddisk>Initialization>HDD2, I get an error saying , Initializing storage device: Error:mke2fs 1.41.12 (17-May-2010) /dev/sdb1 is mounted; will not make a filesystem here. How can I unmount the drive? Ive tried mount manager but that only lets me change the mount points. Is there an option to unmount or a telnet command I can use? MANY THANKS


edit: tried umount /dev/sda via telnet but get the same error as above :/

 

[Tw4T]

edit 2 :just ran the
mkfs.ext3 -m 1 device (e.g. mkfs.ext3 -m 1 /dev/sda1 command. its doing its thing atm. ill let you know if it works

 

[Tw4T]

This command;
mkfs.ext3 -m 1 /dev/sdb1 Seemed to do the trick. Not sure if its the right way to go but my drive is blank now with just a lost-found folder. Hopefully Ill have no problems with it.