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I'm clear how you are trying to re-size partitions. 

First of all, you cannot adjust partitions with data on the drives. You'd have to wipe the drive completely, and then reset your partition(s). I don't know that you can specifically set the size of a partition, but you can choose the number of partitions for a particular drive. But this must be done at the initial set up. 

If you want to keep the old Time Machine backups, unplug the drive and plug in a different drive. Keep the old drive as an archive, and set up the Time Machine for the new drive.

As for drives… I cannot stand Western Digital, though they are popular and generally cheap. I usually use LaCie, and they've been reliable, except for one drive (and I suspect it overheated over time because I had it mounted extremely close to another drive; I suspect it didn't cool sufficiently although it did take years for the drive to fail). 

K

On Apr 1, 2014, at 1:48 PM, Linda Feltner <[log in to unmask]> wrote:

> For those who use Mac Time machine, I wondered why one cannot resize the partitions in an external drive?
> I am consulting to the knowledgebase online. I have an external HD with two partitions. The MAC Disk Utility will not all me to re-size the volumes. I'm about half full (with old backups) and I'd like to resize the partitions, or eliminate the one that was first created and has nothing on it. 
> But it won't let me do that.
> 
> I understand that TM will erase the old backups when it reaches full (when set on automatic), and copy over the new backups. I use a manual backup.  One place said just to delete and reformat the hard drive back to one partition. But I'm a bit hesitant to lose any complete backup of the whole Mac system.
> 
> Just wondered if this was a common thing (not being able to resize the partitions.) 
> 
> I might have to shop for another external drive, and would also appreciate any brands that are new and proven reliable. I've got OWC, Hitachis, Maxtors. 
> 
> thanks
> Linda
> _____________________
> Linda M. Feltner Artist, LLC
> P.O. Box 325
> Hereford, AZ 85615
> (520) 803-0538
> www.lindafeltner.com
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