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Currently I have one portable external hard drive which I use for Windows. It's 1TB and over 300GB is used space. I would like to partition it so I can access the unused space from my Mac. Can you all recommend any partition software which does the job? I am afraid that it would wipe out my current data that's why.

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Generally don't do this. If you really must, then consider reformatting (looses data) in the "exFAT" format which is supported by recent versions of both Windows and OS X. – Thorbjørn Ravn Andersen Aug 5 '12 at 10:57

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You can use Partition Magic in Windows and divide hard on two virtual hard disks. And then use one for Mac and one for Win.

And for Mac and Win can work at one hard drive, just reformat a hard drive to FAT32.

If you don't want format your hard drive:

  1. Open Partition Magic

  2. Create a second virtual hard drive on free space. Recommended percent: 50% on 50%

  3. Reformat second virtual hard drive to FAT32

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Yes, it's because my hard drive is NTFS and from mac, i can't write to that hard drive that's why. Is there anyway that mac can write to NTFS drive ? – knightrider Jul 2 '12 at 6:15
message is edited – CReaTuS Jul 2 '12 at 7:05
ah, I don't want to reformat :/ ... that's why I am looking for partition software just to partition the unused space. – knightrider Jul 2 '12 at 7:12
try get this steps. See up – CReaTuS Jul 2 '12 at 8:29
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If you need to do this a lot, then consider buying a NTFS driver for OS X.

http://www.paragon-software.com/home/ntfs-mac/ is currently $20.

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Parted magic is free/open source software and can resize NTFS partitions. (comes as a disk image for making a bootable USB stick or CD/DVD)

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