QueTek
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Cyrus' journal of notable data recovery projects

MAY
20
2017
ZFS Storage Pool with Multiple VDEVs Recovery

The customer needed Microsoft Exchange databases (.edb files) from a NetGear NAS/SAN crashed due to hardware failures on multiple drives.

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MAY
08
2017
Lost VMDK - Using file-carving

The storage system failed to boot properly. The customer needs only a small set of data whose backup is either corrupt or not available.

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MAY
01
2017
FreeNAS 9.10 ZFS RAIDZ2 Deleted Data Recovery

The customer could not find 1000s of family photos and Microsoft Word documents on his NAS.

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MAR
24
2017
Avoid Saving 42 TB of staging data

The customer needs a way to bypass all virtuallization layers and restore the data directly.

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FEB
02
2017
FreeNAS 9.3 Deleted Data Recovery

A share was deleted from a FreeNAS server. The customer needed to get back his digital photos.

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MAY
9
2016
LVM Thin Pool recovery

A thin provisioning volume on a RAID was unmountable. The customer seeked help after trying many commercial recovery softwares.

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FEB
22
2016
LUKS recovery

A customer has an encrypted NAS. The shared volume was no longer accessible.

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OCT
1
2015
ZFS striped mirrored vdevs recovery

A customer has a FreeNAS with 4x3TB drives. The connections to the drives were lost, and afterward the zpool could not be imported.

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SEP
14
2015
RAID 0 comprising partitions on the same drive

A customer has a RAID 0 that contains two partitions on the same physical hard drive.

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AUG
10
2015
Mac sparse bundle disk image

A customer has a partially corrupted sparse bundle disk image holding an HFS+ volume.

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AUG
7
2015
Thin-provisioned LVM volumes

A customer has a NAS with 8x3TB drives holding two thin-provisioned ext4 volumes. For unknown reasons the volumes became corrupted and inaccessible.

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FEB
25
2015
Crashed ReadyNAS

A ReadyNAS device is no longer accessible. It uses the new Linux file system BtrFS.

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SEP
18
2014
VHD files deleted from an iSCSI device

While creating a new VHD file on an iSCSI device, the customer accidentally deleted existing VHD files.

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AUG
28
2014
Data recovery for RAID 5EE

The NAS failed with one drive damaged beyond repair. The customer failed to determine the RAID settings.

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AUG
12
2014
Data recovery from DiskXtender was a bit tricky

The drives had some bad sectors causing data to be inaccessible. Standard RAID/NAS data recovery methods yielded just around 50% recovery rate.

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JUN
26
2014
Movies were deleted from an Ext4 volume on a QNAP NAS.

The NAS was working fine but movies were accidentally deleted.

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JUN
11
2014
Failed HP SAN that used thin provisioning.

An HP SAN with 8x1TB hard drives failed. It contained 4 logical volumes and was configured with thin provisioning.

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APR
04
2014
Buffalo TS-XH4.0TL/R6 NAS recovery

The NAS initially displayed error code E13 and E26 and data became inaccessible. After the customer applied a firmware update in order to fix the problem, the NAS displayed error code E30 (drive malfunctioning).

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MAR
21
2014
LaCie NAS recovery

A failed Lacie NAS consisted of 5x500 GB hard drives with two drives having damaged sectors. The customer was able to clone the drives to disk image files but had problems reconstructing the data.

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MAR
6
2014
ZFS RAIDZ recovery

A customer had a zpool on a RAIDZ consisting of 3x2TB drives. One drive went bad forcing the RAID to operate in degraded mode. A technician tried to replace the bad drive, but he replaced a good drive by mistake. The RAID rebuild failed and the RAID went down. The customer tried unsuccessfully to import and scrub the zpool.

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FEB
25
2014
Mac OS RAID 5 recovery

A customer needed to recover data from a rebuilt RAID. The customer was able to reconstruct the RAID and the HFS+ volume it contained. However only small files were recovered. All large files were corrupted.

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AUG
13
2013
Iomega StorCenter ix4-200d NAS recovery

A customer had an Iomega StorCenter ix4-200d NAS that rebooted continuously with the error message "insufficient disks for RAID 5".

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JUL
29

2013
8 x 750GB Seagate drive RAID 5 recovery

A customer needed help with an 8x750GB RAID 5. The drives were from a server with a failed controller card. Information about the controller card was not available. The RAID was believed to hold two HFS+ partitions.

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JUL
29

2013
Western Digital My Book Live Duo recovery

The NAS went offline. After forcing the device back online, the customer could not find the shared folder holding his data. He tried to recover the data using File Scavenger®, but most recovered files lost the original name and could not be opened.

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