Okay, this has me mind-blown and completely perplexed! I bought an external hard drive for my mac, as apple gracious gives enough storage space on their laptops (not). Well, I have been using this hard drive for 3 weeks now, perfectly fine. Add files to it, delete files, copy things, backup things, it works!

When I first purchased it I had to format at to FAT32 in order for it to be compatible with my mac. The Problem: Now when I try to add a file it won't let me.

Solving read-only conditions for external hard drives. Format the drive to Mac OS X Extended, provided the drive is only going to be used with a Mac, or format it to ExFAT or FAT, both of which. My external hard drive (Mac OS Extended) became read-only all of a sudden. This happened. 'Get info' shows the following. As you can see,.

Under permissions it shows 'Read Only'. Under drive type it shows NTFS!?!?!?! The only thing I've done since noticing this issue is, upgrade from El Captain OsX to Sierra OsX, which was installed on my internal MacBook hard drive. I really don't have 2-3tb's worth of storage laying around, that I can copy my Hard drive contents to, if I needed to reformat it. What in the world is going on and is there a way to fix it? This makes zero sense to me, how can a drive format change?!

MacBook Pro, macOS Sierra (10.12.2). Your external drive is formatted NTFS for Windows. Prior to upgrading from El Capitan you were running a third party app such as Tuxera that provided the means to write to the NTFS drive. After you upgraded to Sierra the version of the third party app you were using was no longer compatible.

You either need to update the third party app for Sierra or you need to format the external drive for Mac or format it ExFat. Before formatting be sure to back up your data since it will be destroyed during the formatting process.

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