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Like so many others, my 3TB WD MyBook Essential died in the night and would not power-up. After confirm it was not the power adapter, I removed the drive from the case and took it in to Best Buy. Within a minute the Geek Squad tech confirmed the the drive worked and handed me an external drive case. It was a delight until I discovered the partition tables were gone.

Testdisk is now running in analyze mode (MAC Format) on a MacBook pro , 2.66 Intel Core Duo, OSX 10.8.4. Progress is slow (5% per hour, expecting around 20 hours to complete). Does the estimated time and the error message (Bad MAC partition, invalid block0 signature, read_part_mac: bad DPME signature) make sense ? How long should i expect the repair process to take?

The compete log file is shown below.

Thanks
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TestDisk 6.14-WIP, Data Recovery Utility, July 2013
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org
OS: Darwin, kernel 12.4.0 (Darwin Kernel Version 12.4.0: Wed May 1 17:57:12 PDT 2013; root:xnu-2050.2
Compiler: GCC 4.0
Compilation date: 2013-07-12T21:06:21
ext2fs lib: 1.41.8, ntfs lib: libntfs-3g, reiserfs lib: 0.3.1-rc8, ewf lib: 20120504
Hard disk list
Disk /dev/disk0 - 500 GB / 465 GiB - 976773168 sectors (RO), sector size=512
Disk /dev/disk1 - 3000 GB / 2794 GiB - 1565565872 sectors, sector size=512
Disk /dev/disk3 - 536 MB / 512 MiB - 1048650 sectors (RO), sector size=512
Disk /dev/rdisk0 - 500 GB / 465 GiB - 976773168 sectors (RO), sector size=512
Disk /dev/rdisk1 - 3000 GB / 2794 GiB - 1565565872 sectors, sector size=512
Disk /dev/rdisk2 - 38 GB / 35 GiB - 74319016 sectors, sector size=512
Disk /dev/rdisk3 - 536 MB / 512 MiB - 1048650 sectors (RO), sector size=512

Partition table type default to EFI GPT
Disk /dev/disk1 - 3000 GB / 2794 GiB
Partition table type: Mac

Analyse Disk /dev/disk1 - 3000 GB / 2794 GiB - 1565565872 sectors
Current partition structure:
Bad MAC partition, invalid block0 signature
read_part_mac: bad DPME signature