Data Recovery Ireland

Data recovery from an inaccessible G-RAID 8TB Thunderbolt drive showing a red light on power-up

Data recovery from an inaccessible G-RAID 8TB Thunderbolt drive showing a red light on power-up Data Recovery Ireland
The 8TB G-Drive Thunderbolt from G-Techology with HGST 4TB S-ATA Disk X 2 which was unfortunately configured in RAID 0.

DAS (or direct access storage) devices are ideal for tasks involving high data throughput such as photo or 4K video editing. Unlike an NAS, no network equipment such as routers or switches are required. The device can simply be attached to a host system using a USB or Thunderbolt connection.

To increase the I/O (input / output) rates of these devices, it is common for manufacturers to use a RAID 0 configuration. This simply means that two (usually S-ATA HDDs) disks are joined at the hip (using software) to form one (NTFS, HFS+, EXT3 etc.,) data volume. If large files need to be transferred to the volume, the data is written concurrently to the two disks (instead of just one) making the write operation faster.  For example,  typical write speeds would be around 320 MB/s. This is a relatively fast speed for spinning metal platters and is a perfect example of how storage devices can exploit data parallelism afforded by RAID.  

However, there is a downside to using RAID’ed disks like this. Namely if one disk fails, the whole volume topples over like a proverbial house of cards. And this is exactly what happened to a customer we were helping last week. Their 8TB G-RAID (12V 5Amp) device had two HGST 4TB S-ATA disks (HUS726040ALE614) in a RAID 0 configuration. One of the HGST disks developed firmware issues and bad sectors causing the volume to become unrecognised by Windows. When our customer connected his G-RAID drive to his Windows 10 system, it was no longer showing up. Instead, they got an ominous red light on power up.  

Reasons why your G-Technology G-RAID drive no longer shows up in Windows or Mac.

Data recovery from a G-RAID device

Thankfully most of the problems with G-RAID drives can be fixed. In this particular case, we resolved the issues with the firmware and bad sectors. The using byte-for-byte disk images, we performed a detailed analysis on them ascertaining key RAID parameters that were used such as disk order, block size, block order and disk offsets. All of these are parameters are needed for the RAID rebuild process. We eventually rebuilt the RAID. We now had a complete NTFS volume and were able to recover all the drive’s data (video footage and .tiff images) for our very pleased customer.

Is your G-RAID drive not mounting on your Mac? Is your G-RAID drive not showing in Windows? Is your G-RAID disk freezing? Is your iMac or MacBook reporting that your G-RAID disk is “not readable”. Is your G-RAID drive showing a red light? Drive Rescue offer a complete data recovery service for G-RAID devices such as G-RAID Thunderbolt 4TB, 8TB and 12TB. We have extensive experience in recovering and repairing the hard disks (usually HGST 3.5” S-ATA) used inside these drives.

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