I put a Primary and then an extended partition on the WD 250GB drive. When I copied to it I am told that it's an Bad MS-DOS function or something along those lines. I've tried with 2 x drives the same make and model as above..
Thanks for your email. The Western Digital WD Passport comes formatted for a PC, so it does require that you format the drive so that the Mac can recognize it. First, open Disk Utility with the drive connected and running. Then, choose the drive on the left side, then choose the Partition Tab. Change the Current Partition to one, or the number of partitions you would like, then click Options. Here you will change the Partition Map Scheme to GUID, then click OK. Then in the Format Menu drop down choose Mac OS Extended (Journaled), then click Apply and OK. Your drive will now be formatted for a Mac. To format the drive for cross-platform use, make sure that you have backed up all your data from the drive as formatting will destroy any data on the drive. First, connect the drive to your Mac, and open Disk Utility. Then select your drive on the left side of the window and choose the Partition Tab. Then change the Current Partition drop-down menu to 1 partition and click on the Options button. A new window will appear where you will choose Master Boot Record (MBR), then click OK. Then choose Free Space from the Format drop-down menu, click Apply, then OK. Your drive will now appear unformatted. Then choose the Erase tab, choose FAT32 as the Format, name your drive (you will be limited to 11 characters), and click Erase, then OK. Your drive will then appear on the desktop formatted for cross-platform use, and you can copy the data you need to move to your PC and then connect the drive to your PC. If formatting is not an option, the you can buy a program such as MacDrive that will allow your PC to read and write Mac OS files.
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