Technology repair Seagate hard drives

It’s been more than a year since Seagate’s new line of Seagate Barracuda 7200.11 disks appeared in one of the leaders in the production of hard disks – Seagate.

These disks have a density of 250 and 320 gigabytes per plate and a spindle rotation speed of 7200 rpm. In addition, they have a fundamentally new design of the control firmware. All Seagate drives of the older series were based on the principles developed by the engineers of Conner Peripherals, which Seagate acquired in 1995. As for the drives from the new line of Seagate, they represent a blending of these old principles with the SCSI architecture.

It is because of this in the new family of drives there are no models with a PATA interface, and there are only models with a SATA and SAS interface. Unfortunately, the first “pancake” turned out to be “lumpy” – the new family inherited both a number of old flaws in the Konner models, and a number of new specific “sores”.

One of these “sores” manifests itself very often and consists in damage to the official disk information. It manifests itself in two very similar ways: the disk either is not detected in the BIOS of the computer at all, or is determined, but as a drive with zero volume.

The disks that have caused this malfunction began to arrive in the guarantee departments of the vendor companies and were successfully replaced under the warranty for new ones. But, unfortunately, the user lost his data stored on the “lost” disk.

Therefore, we consider here the methods of electronic service, data recovery, applicable at home, with typical faults that occur in the discs of a new family.

As the study showed, the disks either damage the part of the translation table that is responsible for the G-List, in which case the disk is determined by the volume 0, or the contents of the S.M.A.R.T table corrupt.

In the first case, to restore the disk and gain access to the information on it, it is necessary to restore the translation table by recounting it from the defect sheets. However, when recalculating, it is important that defects from the G-List are not transferred to the P-List. (The specifics of the device defect sheets and hard disk drive systems are discussed in our previous articles).

How to do it? Although the disk family is new, it inherited something from the old Konner family. This “something” is the control interface RS-232. To restore the service information, we will use it.

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