Solved Reformat mac external hard drive to work only on win 8.1 PC

November 20, 2013 at 12:35:34
Specs: Windows 8.1
I have a 1TB passport USB drive in the Mac format. I want to use it only on a windows 8.1 PC.
How do I reformat it?

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November 20, 2013 at 13:12:15
To remove a mac volume with Windows you can do it with the "diskpart" command-line utility that's built in to Windows, though I don't know if Windows 8 has it:

if you can't find it on Windows 8, it shouldn't be too difficult to find a friend or relative who's got Windows 7 or Vista.

message edited by phil22

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November 20, 2013 at 15:03:41
I found this in Western Digital's site. Worked like a charm!
dismounted or unmounted for additional information.

Windows 8

Windows 8 includes a built in utility known as Disk Management that can be used to format a hard drive. To format the drive with Disk Management, follow these steps:
1.Right-click on the lower-left corner of the screen and click Disk Management.

2.In the Disk Management window, the lower pane will display a list of available drives. Identify the drive to be partitioned and formatted, and ensure no critical data is on this drive that is not backed up elsewhere. If there is already a partition on the drive, the bar above that drive will appear blue, which indicates the drive is already formatted and may contain data. If there is no critical data on the drive, right-click the bar and click Delete Volume.

NOTE Note: You may need to initialize the drive. If so, please see Answer ID 1018: How to initialize or write a signature to a hard drive or Solid State drive in Windows (7, Vista, XP, 2000).

3.If there is no partition and data on the drive, it will appear as Unallocated, with a black bar on top. Right-click the Unallocated bar and click New Simple Volume.

4.Click Next to proceed.

5.Choose the volume size and click Next. By default, the maximum disk space is already selected.

NOTE Note: To create multiple partitions, select or type a specific number of megabytes (MB) for the first partition and continue to the next step. Once done with this process, create another New Simple Volume in the remaining unallocated space for the next partition. For example, on a 2TB drive, set the volume size to 1000000 (1 TB) and continue to the next step. When done, begin the New Simple Volume process again and select the remaining capacity for another 1TB partition.

6.Assign a drive letter and click Next. By default, this is the next available letter.

7.Set the file system to NTFS and set Allocation unit size to Default. The Volume Label field can be customized. Check the box labeled Perform a quick format and click Next.

8.Click Finish to begin formatting the drive.

9.When complete, the drive will appear with a blue bar as in the image below.

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November 21, 2013 at 03:16:49
✔ Best Answer
Thanks for your contribution, justanoldman, but Windows Disk Management can't deal with mac-formatted partitions, otherwise I would have suggested that myself.

You have to use the Diskpart utility.

The information you found on the WD website is only for dealing with Microsoft partitions (FAT32, NTFS or exFAT).

Please read the OP's problem carefully in future and check that your help information is relevant to the problem before posting it.

message edited by phil22

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November 21, 2013 at 05:16:12
actually, I used the diskpart utility first. Needed both to get the job done.

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