Unable to format Sandisk Extreme USB 3.0 to Mac OS Extended (HFS+)

I have a Sandisk Extreme USB 3.0 flash drive that is 64GB, it used to work properly when i bought it few months ago (formatted to Mac OS Extended [HFS+] file system). Then there was this one day when all out of a sudden it just stopped working properly, it wouldn't access the data when i plug it into my Macbook Pro, it just says that 'The disk you inserted was not readable by the computer' and the only choices were to initialise (brings up disk utility), ignore or eject. I tried to format it back to HFS+ (Mac OS Extended Journaled) but it always gets stuck halfway during 'partitioning' and the estimated time seems to always get longer and longer (i tried leaving it overnight for it to format but in the morning it was still stuck at the 'partitioning' process, and the estimated time has gone up to 7 hours! I tried formatting it to ExFAT and the formatting completed very quickly (within a minute or so) but the problem with this format is that it wouldn't remount (the computer cannot read it even though i plugged and unplugged it multiple times). I next tried to format it to MS-DOS (FAT 32) and this time it worked fine, it was able to remount itself properly after formatting. I am able to format it to ExFAT using a windows PC but the read and write times was horrible (on both macs and PCs). This was not the case before all of this went wrong. My external hard drive was also faulty (read error) but i managed to format it back to HFS+ without difficulty. Is there anything wrong with my computer or flash drive? Any help would be much appreciated, thank you in advance.

It's a driver error on the Guest OS that you installed yourself. Is it Windows or Linux? Try to update it and it should solve the issue for you.

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Thank you for your response. I was able to successfully format the drives Extended journaled when they were out of the raid configuration. I was not able to format as Extended (not journaled) in the Raid configuration.

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Hi,
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greg:
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Hi amilcarfrombarcelona,
It is possible to reset your iPhone back to its original settings using iTunes. See this article for the procedure -
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http://support.apple.com/kb/HT1414
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iOS: Back up and restore your iOS device with iCloud or iTunes
http://support.apple.com/kb/HT1766
Thanks for using Apple Support Communities.
Best,
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HI I have recently purchased sandisk extreme 64 gb through ebay .But i am really disappointed by its perfomance its coping files over the speed of 24 mb .my usb came with file system exfat but i formatted it because of its slow perfomance .Now i have formated it to fat32 file system but still it has the same slow speed. I have updated my drivers but no result Please if any one can help

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Airport Utility:
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You must know people with Macs.. it is 2min work to plug a USB drive into a Mac Laptop and format it Mac OS extended with a quick format.. And that is better IMHO than buying a utility or buying a pre-formatted drive which are often more expensive for no very good or obvious reason.
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Unable to format Sandisk Extreme USB 3.0 to Mac OS Extended (HFS+)

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