External HD changed partition map

Asked Sep 30 '16 at 21:54

Active Sep 30 '16 at 23:52

Viewed 55 times

Apparently my external HD went crazy (I've been using it without problem for a long time) and decided to change partition scheme from GUID to FDisk (look at disk1) but my data remains as HFS+ (disk1s2)...

I have important data in that HD, so my question is

Is there a way to repair this change in partition scheme without losing my data??

Which blocks do I need to delete to create the new GPT scheme?

I have found a program called textdisk that seems to be able to do it but I am afraid of erasing the data by accident.

Any help would be greatly appreciated!

EDIT: Tried Klanomath suggestion in: Need help deciphering TestDisk results to fix HDD and changed to GPT scheme but got error during verification.

edited Jun 15 '20 at 08:04

Community

asked Sep 30 '16 at 21:54

Luis Vera

It's possible to repair the disk without textdisk (TestDisk?). There are already some questions & answers here. I'll try to find the proper one and add a link here. – klanomath Sep 30 '16 at 23:35
Here is the proper answer: Accidently deleted some small sized partitions when installing Windows. OSX Partition wont boot. You have to replace disk0 by disk1 in David's answer: ...unmountdisk /dev/disk1 fdisk -e /dev/disk1 <<<... – klanomath Sep 30 '16 at 23:43
@klanomath Thanks! Edited question, but gonna take a look at that. Already changed to GPT scheme but still won't mount. – Luis Vera Sep 30 '16 at 23:47
Which answer of mine ("Klanomath's suggestion") are you referring to in your question? – klanomath Sep 30 '16 at 23:48
@klanomath sorry, didn't include link but was this one: http://apple.stackexchange.com/questions/250297/need-help-deciphering-testdisk-results-to-fix-hdd – Luis Vera Sep 30 '16 at 23:50
Hmm, what happened with the external disk? Did you attach it to a PC? – klanomath Sep 30 '16 at 23:53
@klanomath nope, only thing I did was update OS X to "El Capitan" – Luis Vera Sep 30 '16 at 23:56
Let us continue this discussion in chat. – klanomath Sep 30 '16 at 23:56

External HD changed partition map

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