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I'm going put SSD drive instead of DVD and move OS-X to SSD. Big capacity HDD I'm gonig leave to have some place for large multimedia data and archives.

So I whant keep HHD in spindle off mode most time and mount it just on demand, what should I do to prevent HDD to be mounted and powered while system boot (after restart) and how to manage spindle with the command line?

Thank you!

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to disable the drive from mounting during boot :

Find the uuid of the drive (in terminal):

diskutil info /Volumes/[name]

Then create a new file called /etc/fstab and in it put

UUID=34DFD44D-489C-1C22-01D8-DFDF288C102F none hfs rw,noauto 0 0

just replace the UUID above with the actual UUID of the drive.

Use the following command to view a list of drives/partitions

diskutil list

And then issue the mount command to mount the drive

sudo mount /dev/disk1s1 /Volumes/DriveName

Obviously change the disk id and mount folder to suit your system.

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Better use diskutil mount [name] and diskutil umount [name]. – mspasov Apr 15 '11 at 14:44
Why it is better? – A B Apr 15 '11 at 17:38

sudo diskutil eject /dev/disk1 will turn off spindle

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