Previously windows used external drive to be used in mac (and windows)
i´ve just bought a macbook and planned to use a couple of external drives i previously used on my pc with time machine and whatnot. only it seems they are write-protected in mac os, so they can´t be used as back-up drives. do i have to format them again using mac, or do it in windows, or is there a way around this? and can it be done so both mac and windows recognizes it as writable?
thanks
Dave Sawyer wrote:
They're probably formatted NTFS, which Mac OS X can read but not write. There are third-party NTFS drivers, one open-source and one commercial, but you can just reformat the drive as FAT32 (MS-DOS format in Disk Utility) and it will work just fine with both your Mac and Windows systems.
If the OPs intent is to use it with Time Machine, the external drive needs to be formatted HFS+ (Mac OS Extended (Journaled) via Disk Utility. I believe there is a Windows app that permits viewing of HFS+ drives. Since you have a 'couple' of external HDDs, it's probably best to use a dedicated HDD just for TM backups.
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It is surprising to me that you were able to get this far. If the drive is formated in HFS+ then you would not be able to view the files on the drive from Windows.
Should I reformat the drive to be compatible with both platforms (after backing up of course)? What format options should I select? Is this done on the Mac or PC? Am I likely to run into any problems?
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When reformatting you should use FAT or exFAT, either one will work. You can format the drive from Windows or Mac as both OSes can do it.
If you want to avoid the headache of reformating you can do what johnbeardy said and purchase 3rd party software to add HFS+ support to Windows. Your options are Paragon or MacDrive. Normally I would be wary of this since file systems are something important that you don't want to use unreliable software for but Paragon and MacDrive both look reputable.
Am I likely to run into any problems?
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You would need MacDrive if you want to use the NTFS (NT filse system) with the Seagate.
But if you choose FAT32 (that's what OSX calls MS-DOS) you don't need any kind of extra software to access (read/write) it from both Mac and PC.
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