3tb WD30EZRX HFS(+?) power surge

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driggers
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Joined: 09 Mar 2016, 16:22

3tb WD30EZRX HFS(+?) power surge

#1 Post by driggers » 11 Mar 2016, 21:39

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

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

#2 Post by cgrenier » 12 Mar 2016, 08:10

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

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