unmount external disk in terminal

Now you're getting somewhere.....looks like you don't own the disk/have read/write privileges to it....unfortunately that's where my Unix knowledge ends but I'm at a loss if you're using sudo and the account in question has admin privileges

Try enabling root user and doing it? Feel free to not follow this advice though..I'm no admin. expert.

You need spaces between options and paths and double-quotes around names with spaces. So,

*sudo vsdbutil -a/dev/disk1/Apple_HFS Fantom*

won't work. Try

*sudo vsdbutil -a /dev/disk1/"Apple_HFS Fantom"*

or

*sudo vsdbutil -a /Volumes/"Apple_HFS Fantom"*

You have a space in your drive's name. Use this command baltwo suggested:

sudo vsdbutil -a /Volumes/"Apple_HFS Fantom"

or escape the space in the drive's name like this:

sudo vsdbutil -a /Volumes/Apple_HFS\ Fantom

bannonto,

Would you post the output from the following commands-

ls -l /Volumes

cat /private/var/db/volinfo.database

disktool -l

Enter the commands one at a time and copy the command and the output to a text file then post the contents of the text file.

Message was edited by: Mark Jalbert

Hi bannonto,

Let me go over the info that you have provided.

The ls command shows two drives on your computer, Altosa is the boot drive and Fantom is the other drive. I though the name of the drive was "Apple_HFS Fantom"?
The permissions on Fantom do not allow any users to read or write to the drive. This can be fixed.

The volinfo.database shows four different disks all permissions enabled. Whether you have mounted four different disk or not isn't a concern at the moment.

The disktool command shows two partition slices with an hfs file system on them-
*Disk Appeared ('disk1s3',Mountpoint = '', fsType = 'hfs', volName = 'Fantom')
*Disk Appeared ('disk0s2',Mountpoint = '/', fsType = 'hfs', volName = 'Altosa')

I need you to confirm the drive name Fantom. Use the following command, post the command and the text output from the command:

mount

Easy enough to fix. Open the Terminal.app- You seem to be running a root shell, so copy the following command from this post, paste it into the Terminal app window and press the return key.

chmod 777 /Volumes/Fantom

OK, now I get this message:Unmount of disk0s2 failed

disk0s2 is your boot drive. Are you trying to verify your boot drive?

The information indicates that "Fantom" is not mounted.

*Disk Appeared ('disk1s3',Mountpoint = '', fsType = 'hfs', volName = 'Fantom')
There is no mount point listed nor does the command mount indicate that Fantom is mounted.
Unknown-00-17-f2-e7-2e-90:~ root# mount
/dev/disk0s2 on / (hfs, local, journaled)
devfs on /dev (devfs, local)
fdesc on /dev (fdesc, union)
map -hosts on /net (autofs, automounted)
map auto_home on /home (autofs, automounted)

Message was edited by: Mark Jalbert