Partition of hard drive won't work...

I currently have a WD MyBook with the following info
Name : WD My Book 1110 Media
Type : Disk
Partition Map Scheme : Apple Partition Map
Disk Identifier : disk1
Media Name : WD My Book 1110 Media
Media Type : Generic
Connection Bus : USB
USB Serial Number : 574341563543373737303130
Device Tree : IODeviceTree:/PCI0@0/EHC1@1D,7
Writable : Yes
Ejectable : Yes
Mac OS 9 Drivers Installed : No
Location : External
Total Capacity : 999.5 GB (999,501,594,624 Bytes)
S.M.A.R.T. Status : Not Supported
Disk Number : 1
Partition Number : 0
The drive currently has two partitions on it, one for my iMac time machine and one for my MacBook Pro time machine. When I try to repartition this drive in Disk Utility I get the error message:
"Partition failed with the error:
Could not modify partition map because filesystem verification failed"
I need to clear some storage space on my internal MacBook drive and I really don't want to spend money on another external disk when I have over 500 GB just sitting there empty. I would just write directly to the current partitions but OSX flips out when you try to save random files straight to a Time Machine formatted disk.

This seems to be a common question and problem around these parts. I am certain one of the resident geniuses will soon be responding.
While we both wait for that to happen, you may find some helpful information by doing a search for "repartition hard drive" or "repartition time machine" in that little search box just to the right. There seems to be lots of good information there.
But remember that monkeying around with partitioning is not without risk, and we are talking about your Time Machine backups here.
Be careful and good luck.
Arch

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asad.a wrote:
I believe the reasons behind this must have something to do with the errors highlighted by the repair process (as copied above)- errors I don't understand.
Disk Utility can't repair NTFS volumes.
If the drive is not seriously damaged ...
Go to Disk Utility
Click on the external Drive (not on the existing partition)
Click on Partition section in Disk Utility
In the Pane under "Current Scheme" highlite the Partition and then click the "-" (minus) sign down left.
Click on the dropdown "Current Scheme" and choose a matching scheme
On Format choose "Mac OS extended journaled"
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Message was edited by: lupunus / typo's fixed

Copying large files to external hard drive won't work

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Partition of hard drive won't work...

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