Maxtor 7H500F0 SATA Hard Drive very slow speeds

[ecktt]

I bought 4 Maxtor 7H500F0 SATA Hard Drive and have had them in a software RAID 5 for many years on M$ Server 2008 and the M$ Server 2008R2. Recently, the RAID set broke, showed up as failed redundancy and would never complete a rebuild. After backing up all the data, all the drives were moved to another computer where they were individually zero filled with Darik’s Boot and Nuke (1.0.7). They all completed successfully but one drive’s write speeds hovered around 10MBps while the others averaged 50+MBps. I downloaded the newest version of the Seatools for DOS and tested each disk individually. Again, they all completed without error.
I think I can negate the computer’s mother board, drivers, SATA cable and power as the source of failure. All the drives are housed in a Cooler Master 4 Disk drive cage with a Scythe 120mm 110cmf fan for cooling, so over heating was not an issue.
What can be the performance issue source? What is the solution?

[N.C.]

I bought 4 Maxtor 7H500F0 SATA Hard Drive and have had them in a software RAID 5 for many years on M$ Server 2008 and the M$ Server 2008R2. Recently, the RAID set broke, showed up as failed redundancy and would never complete a rebuild. After backing up all the data, all the drives were moved to another computer where they were individually zero filled with Darik’s Boot and Nuke (1.0.7). They all completed successfully but one drive’s write speeds hovered around 10MBps while the others averaged 50+MBps. I downloaded the newest version of the Seatools for DOS and tested each disk individually. Again, they all completed without error.
I think I can negate the computer’s mother board, drivers, SATA cable and power as the source of failure. All the drives are housed in a Cooler Master 4 Disk drive cage with a Scythe 120mm 110cmf fan for cooling, so over heating was not an issue.
What can be the performance issue source? What is the solution?

Hi,

These are stone-old drives.
Obviously had at least one weak head wich can't write/verify faster than this speed.

Solution?
Well, these drives are quite rare models here in Hungary.
If you can send the failing one to me, i will send to you one working good 500GB but different model.
I am interested about all of 4 if you can give those to me.
I can agree any contract about data protection and destroy.
We are data recovery firm here.

Janos