No HFS or HFS+ structure

How to use TestDisk to recover lost partition
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jbenesch
Posts: 1
Joined: 23 May 2012, 18:55

No HFS or HFS+ structure

#1 Postby jbenesch » 23 May 2012, 19:03

I have a Western Digital 120 GB / 111 GiB - CHS 234441648 1 1 External Hard Drive that is no longer mounting on my Mac OS X.

I have run the testdisk analyse utility and can see my partition under No HFS Structure:

Current partition structure:
Partition Start End Size in sectors

1 P EFI System 40 409639 409600 [EFI System Partition]
No HFS or HFS+ structure
2 P Mac HFS 409640 234179463 233769824 [Chris HD]
2 P Mac HFS 409640 234179463 233769824 [Chris HD]



When I then run the Quick Search I reach another error:

search_part()
Disk /dev/disk1 - 120 GB / 111 GiB - CHS 234441648 1 1
check_FAT: Unusual media descriptor (0xf0!=0xf8)
FAT32 at 40/0/1
FAT1 : 32-3182
FAT2 : 3183-6333
start_rootdir : 6334 root cluster : 2
Data : 6334-409599
sectors : 409600
cluster_size : 1
no_of_cluster : 403266 (2 - 403267)
fat_length 3151 calculated 3151
heads/cylinder 16 (FAT) != 1 (HD)
sect/track 32 (FAT) != 1 (HD)



I have continued to let the utility run for a while and now am seeing this error:

FAT32 at 40/0/1
EFI System 40 409639 409600 [EFI]
FAT32, blocksize=512, 209 MB / 200 MiB
file_pread(4,16,buffer,409672(409672/0/1)) read err: Input/output error
file_pread(4,16,buffer,409673(409673/0/1)) read err: Input/output error
file_pread(4,16,buffer,409674(409674/0/1)) read err: Input/output error
file_pread(4,16,buffer,409675(409675/0/1)) read err: Input/output error
file_pread(4,16,buffer,409676(409676/0/1)) read err: Input/output error
file_pread(4,16,buffer,409677(409677/0/1)) read err: Input/output error
file_pread(4,16,buffer,409678(409678/0/1)) read err: Input/output error
file_pread(4,16,buffer,409679(409679/0/1)) read err: Input/output error
file_pread(4,16,buffer,409680(409680/0/1)) read err: Input/output error
file_pread(4,1,buffer,409680(409680/0/1)) read err: Input/output error
file_pread(4,1,buffer,409681(409681/0/1)) read err: Input/output error
file_pread(4,16,buffer,409682(409682/0/1)) read err: Input/output error
file_pread(4,1,buffer,409682(409682/0/1)) read err: Input/output error
file_pread(4,16,buffer,409673(409673/0/1)) read err: Input/output error
file_pread(4,16,buffer,409683(409683/0/1)) read err: Input/output error
file_pread(4,1,buffer,409683(409683/0/1)) read err: Input/output error
file_pread(4,16,buffer,409684(409684/0/1)) read err: Input/output error




I am lost on how to continue. I am looking to recover data from the [Chris HD] partition.

Any help would be tremendously appreciated.

Thanks,
J

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