"Updating Boot Support Partitions"

[gunug]

Okay, the process is common around here, at least since we started to Chromebooks.  We use a flash drive to "reinstall" the Chrome OS onto one and eventually, after "n" number of times, the flash drive no longer works.  Since most of them were originally MS-DOS FAT flash drives I try to use a PC to reformat them but usually I can't and I take it to my MACPRO and run Disk Utility to format it as MS-DOS FAT and then verify and repair it (just for fun and to test it) and it kind of hangs at the end of the process saying "Updating Boot Support Partitions. . ." and I can quit Disk Utility and the drive seems okay but what would it be doing to a Boot Support Partition on a MSDOS FAT drive that wouldn't boot for lack of bootable OS?

[Xairbusdriver]

Are there any other flash drives available? Many are just not reliable and 'wear out' after very few read/write cycles (same problem SSDs) have. Their reliability is usually closely equivalent to their price... ;(

You might try a different disk utility, also. I'm sure your school system has lots of extra money laying around for these kinds of tools...

[gunug]

I "may" have figured out part of it: The Chrome tries to put 8 or so partitions onto the drive and being Unix-like the OS 10.10 seems to like to format them better into a single Journaled Mac type partition.
Then I redo them into the sort of original MSDOS FAT scheme and they seem to work for another iteration of being setup as what Chrome wants to do with them.  Seems like a lot of effort.  I did get one
that complained about unwritten data or unfinished data and I repaired that with the First Aid in Disk Utility.  

I think Window 7 isn't really coping too well with even MSDOS FAT partitions; I know that there are probably formatters and such that might handle this better but the MACPRO seems to handle this okay!