The Vault - Help & Advice

This is a collection of articles written by us from
2014 onwards that offer help and advice to readers
about issues we encountered with equipment that
came to us for recovery.

This section is not maintained.
Information in the articles was correct at the time
they were written but may now be out of date.

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Data Recovery from disk drives with a corrupt 25P05AVG chip

Introduction: The 25P05AVG is a 512k flash ROM chip often used in hard disk drives. Located on the controller board, it commonly contains a portion of the service area data that is used to boot and calibrate the drive.

Data Recovery: We have seen several hard drives where the contents of this chip have become corrupt. When this occurs access to the hard drive is lost. The following failure symptoms will also be noticed:

The drive will not longer be recognised in the BIOS when the machine is powered on
The hard drive will make a ticking noise. (The behaviour is similar to the drive having head problems, but the cause is the corrupt chip – the heads are fine)

To recover the data it is necessary to remove the corruption in the ROM. The drive will then be correctly recognised and the data be accessible.

Data Clinic are often able to fully recover data from hard disk drives suffering from a data corruption of the 25P05AVG chip. Please contact us for further details.

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The Vault - Help & Advice

Data Recovery from disk drives with a corrupt 25P05AVG chip