USB readers of reformatting to insert (intermittent)

My MacBook Pro since the recent OS X install 10.11.6, now completely reformat my external USB drives when inserting (about 20% of the time). The problem affects WD MyBook 2 TB external drives (x 2), WD MyBook Duo 12 TB NAS, as well as memory cards SD and my digital SLR via a card reader Lexar CF. The problem is intermittent. Sometimes, when I insert the above discs they mount as usual and display the structure of HFS files and any content file, on other occasions, there is a slight delay (about 40 seconds) after inserting a disc, then the drive is mounted as if it were brand new, straight out of the box. the 'hidden' EFI drive mount on the desktop, as well as a now empty and reformatted HFS disk partition. All data on the disks disappeared.

I tried to run apple on the disks disk utility are deleted. I tried to run "Disk Drill". These utilities simply see the re-formatted and declare that readers have no errors or problems detected. I zapped my PRAM, I ran FSCK, I updated permissions, run all the cron tasks, run "Clean My Mac", emptied all the caches, etc. Even after all of this interview, I've known this same player re-formatting on the insertion of external hard drives.

I lose the MASSIVE amounts of data when this problem occurs (Luckily most of the data are saved elsewhere however). One of the 2 TB drives was my Time Machine backup, so all the backups in this timeMachine are now lost. The NAS 12 to drive is a server backup, but I'll now have to re - build this backup (which takes days to copy all the data back). Camera memory cards are my biggest concern: my cameras contain each, 2 memory cards whenever I take a hit on the camera, the file is written on two cards: I've recently returned from a shoot day professional, inserted my CF card via a USB card reader only to find he had been "cleared" by the operating system , then I crossed my fingers and inserted the 2nd memory card camera that fortunately does not remove.

At this point I can't be sure if these disks will be reformatted arbitrarily by the operating system again, because the problem is intermittent and I can't find a way to reproduce the problem (not that I really want to replicate). So I am VERY worried and fear now to connect external drives of any kind to my main computer. I am now back to my MacBook Pro 2006 for any external USB use, like I can't trust my newer Mac totally up-to-date.

Any help that can be provided would be greatly appreciated!

Questionable computer features as follows:

Mac OS X 10.11.6

MacBook Pro 15 retina "(mid-2012)

Intel Core i7 2.7 GHz

16 GB 1600 MHz DDR3

Various disks USB, NAS, USB, memory, card reader Lexar cards


I can only speculate what the cause to occur, but a main suspect would be "disk utility" installed by Western Digital. These things have tended to cause spontaneous loss of data you describe. Products may go under the name of "Drive Manager", "SmartWare" or words to that effect. If you installed anything resembling this description, uninstall it according to his instructions.

The first thing you should so when buying an external hard drive's format using disk utility, thus erasing all unnecessary garbage manufacturer could include with it. For example, Seagate drives also include similar to Western Digital utilities. If I'm not aware of cause them similar problems, their "disk utility" software should also be eliminated with extreme prejudice.

I tried to run "Disk Drill". These utilities simply see the re-formatted and declare that readers have no errors or problems detected. I zapped my PRAM, I ran FSCK, I updated permissions, run all the cron tasks, run "Clean My Mac", emptied all the caches, etc.

Stop doing these things. Do not use any what non-Apple "disk utility" regardless of the origin or apparent popularity. "Disk Drill" has been known to delete perfectly good disks. Uninstall 'CleanMyMac' according to his instructions. Like all software 'cleaning up' in the same way by category, it's a scam whose sole purpose is to take your money. Just a Mac unmodified by this ill-conceived garbage clears spontaneously hard drives.

Leave the cache files and only cron tasks. The permissions are no longer a problem with El Capitan. Don't mess with them. Let your Mac works the way it was designed to work - without the maintenance that you seem to think it requires.

Tags: Mac OS & System Software

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