For maximum compatibility, back up everything from the external hard drive onto your Mac. If the Partition Scheme were Apple Partition Map, it would also not show up. Format portable hard drive for windows and mac. Nov 24, 2016 - To format a USB Flash Drive to FAT32 in Mac OS X follow the next steps. Connect the USB Fash Drive to the Mac OS X computer. Format USB Drive Mac using Terminal. We also have a Command Line Disk Utility interface in Mac. And we can use it to format the USB on Mac as well. Now lets see how we do this. First open the terminal (Again press command + space, write terminal. A few years ago I bought two 32GB USB flash drives, one Belkin and the other a SanDisk. Recently they both have gone into 'Read Only' mode. I've backed them up and would like to reformat them in Mac Extended format, they are currently formatted in MS DOS (FAT32) format. In Disk Utility the choices are greyed out. In the Get Info window under 'Sharing & Permissions' it says 'You can only read'. The drives act this way on my MacBook running 10.6.8 and a Mini running Yosemite. I found some info online but am not familiar with Terminal. Disk Utility in Safe Mode didn't yield results. Does anybody know the solution to this? Sometimes when an old flashdrive (that was previously working) suddenly becomes 'read only', it indicates that something has failed on the drive internally. Usually, the best thing to do is. Copy the data from it. Tuxera ntfs for mac. Just be happy that it chose not to 'go completely dark' on you. As a 'last attempt', I would take the drive to a WINDOWS PC and try to erase them on that. Try a couple of different formatting schemes (exfat, etc.). If that doesn't work, look for the nearest trash can and toss 'em into it. Longkeg I have tried both (see attached pics) in Leopard and Yosemite. I don't see any button to enable 'advanced' options. Fishrrman that's pretty much where I'm at. The drives do have important files on them so they are backups, but both are both good brands and only about 3 years old. I'm asking around to see if any of my friends have Windows computers, I suspect formatting them that way has a chance of working. I found lots of webpages devoted to this and was able to get Terminal to try what someone suggested but that didn't work. I'm guessing that when I bought the flashdrives they came formatted in MS-DOS (FAT32) and maybe if I had formatted them in Mac Extended then this wouldn't have happened. Since it happened to two flashdrives seemingly at the same time I suspect something in the continuing saga of idiotic operating software upgrades is what caused this. Thanks for your replies. Yes, the drives are probably bad, or at least have corrupt files that have made them shut down to save what's already there. As far as First Aid, when I use that on my Mac Mini running Yosemite the only option available is 'verify disk', the other options for permissions and to repair the disk aren't even greyed out, they're just a black space. About a week ago I bought a new 32GB San Disk USB drive and right out of the box formatted it to Mac Extended and we'll see how that goes. But the other ones lasted 3 or so years so my main concern is more: These USB drives are to back up my artwork. Now I'm wondering if I'm using the right format. DVD's seem flakey as the surface is open to scratches like an old LP record. Now it seems that USB drives aren't all that safe. I don't use any cloud/internet places to save anything, that seems real stupid to do, you're trusting people you don't know and will never meet. So maybe the best thing is just what I'm doing, save a bunch of USB drives and SD cards in multiple places. I have a couple of 'real' hard drives that I use to back up files and installers. I have been using flash drives for about 20(?) years now. I still have the first flash drive that I ever bought (64 MB). It still works, and has some old firmware for the original iMac G3, plus some other old stuff. When my 2nd ever flash drive started working VERY slow about 2 weeks after I bought it, I realized there must be be some natural limitations in that format. As those flash drives became cheaper and cheaper, I also could tell that flash drives are NOT for archiving.
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