HT205004: About the OS X Yosemite v10.10.5 Update
Learn about About the OS X Yosemite v10.10.5 Update
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Helpful answers
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Dec 7, 2015 9:09 AM in response to Sugrkissby FatMac>MacPro,You haven't stated what it is about a USB Flash drive that doesn't work.
Does it not mount, not appear in the Finder, not appear in Disk Utility, it does all that but you can't save files to it?
If it's a matter of saving files, the Flash drive may be formatted NTFS; reformatting it to exFAT would allow writing files and you can do that with Disk Utility.
In any case, installing the 10.10.5 update most likely won't be the solution.