External Hard Drive only for Time Machine?

I just bought a 500GB external HD and just ordered Leopard. I'm wanting to use the hard drive for my iTunes library rather than keep it on the internal HD due to the size.
My question is, if I then use it for Time Machine, will it be only for TM or can I do both?
And if I can do both, will it erase what is currently on there while setting it up for TM?

Apple doesnt recommend it, but it shouldnt be any problem. Time Machine creates a backup directory in which it keeps all the backup info. As long as there's space you can use the drive for other items. I have an internal 500GB drive I use for backup, and I keep some large files on it. The problem will be sooner or later the drive will just fill up with backup info, and time machine at that point will dynamically erase the oldest backups but will not have space for storing other files. Basically dont rely on the drive to have space for storing extra stuff. Partitioning the thing will prevent this, but it will make your backup drive smaller.

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    In Disk Utility
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    Message was edited by: b j t

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    Welcome to Apple Support Communities
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    I'd like to store my Aperture /IMovie Libraries on an external hard drive.
    That is fine and recommended.. use the fastest disk you can afford.. ie Thunderbolt>USB3>FW800>USB2.
    In addition, I'd like to partition the external hard drive so that Time Machine can use it to both back up my IMac and the external library drives.
    Let me be clear.. you want to partition the one disk.. use it for TM and move your files to the external disk.. and then backup to the same disk.. You can do it.. but that is not a backup.. that is an experiment in how long you can get away with running files and backups on the same disk before you lose everything.. like Russian Roulette.. pull the trigger enough times and laws of probability will do you in.
    You must have backups on a different disk .. otherwise it is pointless.
    Can I set up a RAID 5 format for redundancy?
    No.. you can buy special USB and Thunderbolt external drives that support RAID..
    BUT that is still not a backup.. let me show why.. you make a silly move and corrupt your file in aperture.. it is not that rare.
    Raid will corrupt all copies of the files.. it is replicated across all disks.
    Delete a photo it is deleted across all disks.. you have no recovery.
    Alway, always consider RAID system one disk.. backup onto another disk.. and if the photos or movies are at all important to you.. ie your family .. make another copy and store in a relatives house.. There is no such thing as too much redundancy.

  • I have an IMAC and I'm running OSX 10.9.2.  I'd like to store my Aperture /IMovie Libraries to an external hard drive.  In addition, I'd like to partition the external hard drive so that Time Machine can use it to both back up my IMac and the externa

    I have an IMAC and I'm running OSX 10.9.2.  I'd like to store my Aperture /IMovie Libraries on an external hard drive.  In addition, I'd like to partition the external hard drive so that Time Machine can use it to both back up my IMac and the external library drives.  Is this possible? Can I set up a RAID 5 format for redundancy?

    I'd like to store my Aperture /IMovie Libraries on an external hard drive.
    That is fine and recommended.. use the fastest disk you can afford.. ie Thunderbolt>USB3>FW800>USB2.
    In addition, I'd like to partition the external hard drive so that Time Machine can use it to both back up my IMac and the external library drives.
    Let me be clear.. you want to partition the one disk.. use it for TM and move your files to the external disk.. and then backup to the same disk.. You can do it.. but that is not a backup.. that is an experiment in how long you can get away with running files and backups on the same disk before you lose everything.. like Russian Roulette.. pull the trigger enough times and laws of probability will do you in.
    You must have backups on a different disk .. otherwise it is pointless.
    Can I set up a RAID 5 format for redundancy?
    No.. you can buy special USB and Thunderbolt external drives that support RAID..
    BUT that is still not a backup.. let me show why.. you make a silly move and corrupt your file in aperture.. it is not that rare.
    Raid will corrupt all copies of the files.. it is replicated across all disks.
    Delete a photo it is deleted across all disks.. you have no recovery.
    Alway, always consider RAID system one disk.. backup onto another disk.. and if the photos or movies are at all important to you.. ie your family .. make another copy and store in a relatives house.. There is no such thing as too much redundancy.

  • I use an external hard drive as a Time Machine back up, but I want to use another external hard drive to save movies, photos on it, but it won't give me the option to save anything on the new external hard drive. Nothing is wrong with the external hard.

    I use an external hard drive as a Time Machine back up, but I want to use another external hard drive to save movies, photos on it, but it won't give me the option to save anything on the new external hard drive. Nothing is wrong with the external hard. 

    Hi Clarkett99,
    To use an external hard drive for your iTunes library, see the steps in this article -
    iTunes: Back up your iTunes library by copying to an external hard drive
    http://support.apple.com/kb/HT1751
    iPhoto can be used in a similar way, follow the steps in this previous discussion -
    how do I save photos and their albums...: Apple Support Communities
    https://discussions.apple.com/thread/3744259
    Thanks for using Apple Support Communities.
    Best,
    Brett L

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