3tb WD30EZRX HFS(+?) power surge

How to use TestDisk to recover lost partition
Forum rules
When asking for technical support:
- Search for posts on the same topic before posting a new question.
- Give clear, specific information in the title of your post.
- Include as many details as you can, MOST POSTS WILL GET ONLY ONE OR TWO ANSWERS.
- Post a follow up with a "Thank you" or "This worked!"
- When you learn something, use that knowledge to HELP ANOTHER USER LATER.
Before posting, please read https://www.cgsecurity.org/testdisk.pdf
Locked
Message
Author
driggers
Posts: 1
Joined: 09 Mar 2016, 16:22

3tb WD30EZRX HFS(+?) power surge

#1 Post by driggers »

I have a 3TB WD30EZRX that I was using as an external backup for my Mac, so I believe it was formatted HFS+ (the usual Mac format, extended journaled). I ran TestDisk and it warned me that "partition sector doesn't have the endmark 0xaa55". I wasn't sure what geometry to select (tried 1 head 1 sector / head, as well as 16 heads, 63 sectors), and it would not give me a hint as to what type of partition table it has. It appeared to default to the second choice (EFI?), but that seemed to stay on 01% of the scan, so I tried it with Intel partition table and I get the output below (this is the second time it ran, and it did not find a partition before).

The story is that I the disk got a power surge of 22 Volts for un unknown amount of time. I removed the TVS diode and it spun up again in a new enclosure, but showed as "uninitialised" by mac os x.

I didn't change the sector size, but i'm confused by logical 4096 and physical 512 sized sectors. which one do I choose for these bigger *TB drives?

Your help is much appreciated!

Code: Select all

Disk /dev/rdisk2 - 3000 GB / 2794 GiB - CHS 5814021 16 63
Analyse cylinder 5137898/5814020: 88%


Invalid FAT boot sector
 0 D FAT16 >32M           1138838   6 50 2319657   8 28 1190265657
  FAT16 >32M           1138838   6 50 2319657   8 28 1190265657
check_FAT: can't read FAT boot sector
Invalid FAT boot sector
 0 D FAT12                6240542  13 11 8380364   4 45 2156940044
  FAT12                6240542  13 11 8380364   4 45 2156940044
Invalid FAT boot sector
 0 D FAT32                5380845   1 58 8995293   3 10 3643363663
  FAT32                5380845   1 58 8995293   3 10 3643363663
check_FAT: can't read FAT boot sector
Invalid FAT boot sector
 0 D FAT16 <32M           8126824   0 47 8823145  13 41  701892382
  FAT16 <32M           8126824   0 47 8823145  13 41  701892382

User avatar
cgrenier
Site Admin
Posts: 5432
Joined: 18 Feb 2012, 15:08
Location: Le Perreux Sur Marne, France
Contact:

Re: 3tb WD30EZRX HFS(+?) power surge

#2 Post by cgrenier »

EFI GPT is usually the correct partition table for disk over 2 TB.
Run TestDisk, in the Advanced menu, select the HFS+ partition, Superblock

Locked