AFH Adjustment Successes

[lcoughey]

Drive Model: ST2000LM007-1R8174

Using PC3000 DE, was able to get most 3 of 4 heads imaged, but head 2 was hanging up getting mostly read errors. Made a few AFH adjustments usingn MRT Ultra and turned an ETA of > 161 days to image 222.7GB into a job that was done within 10 hours.

Not only did this save time, it also helped avoid the risks that come with a head swap on a Seagate Rosewood hard drive.
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ST2000LM007-1R8174-AFH.jpg (62.22 KiB) Viewed 13565 times

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Got a similar story, please share it here. I've had success dozens of times and will start to document future cases moving forward.

[fzabkar]

If you restore the original AFH settings, does the bad head now read at the faster speed?

I'm wondering whether the low flying height causes head slaps which burnish any contaminants from the heads.

[lcoughey]

Good question. In this case, no. Some Grendadas I worked on the past left me wondering.

[Skyclad]

AFH-Zone-Original.PNG (71.21 KiB) Viewed 8455 times

Drive Model: ST2000LM007-1R8174

Using PC3000 DE, was able to get most 3 of 4 heads imaged, but head 2 was hanging up getting mostly read errors. Made a few AFH adjustments usingn MRT Ultra and turned an ETA of > 161 days to image 222.7GB into a job that was done within 10 hours.

Not only did this save time, it also helped avoid the risks that come with a head swap on a Seagate Rosewood hard drive.
-
ST2000LM007-1R8174-AFH.jpg
-
Got a similar story, please share it here. I've had success dozens of times and will start to document future cases moving forward.

In the two cases where I'm working I have not been successful.
Taking advantage of the implementation in the last PC3K update I changed the RHtClr and PreHeat value as suggested by ACE of 20, i.e. in the last case (ST2000LM007) from the original value of 4A to 5E. This in increments of one.

I did all the adjustments in RAM but with head 0 (which is the problematic one) I always got mOLD sectors. In DE I set PIO mode with Read Timeout 800ms and blocks of 8 sectors, forward direction.

I will try going over 5E and let you know.

[lcoughey]

Even though I usually set it for jumps of 0x10, I tend to jump by 0x20 for the first couple of attempts. It doesn't always works, especially with the Rosewood series drives. I always save to ROM and repower to test. At the end of the day, a head swap usually works when AFH adjustments don't.

[Skyclad]

Even though I usually set it for jumps of 0x10, I tend to jump by 0x20 for the first couple of attempts. It doesn't always works, especially with the Rosewood series drives. I always save to ROM and repower to test. At the end of the day, a head swap usually works when AFH adjustments don't.

I actually wanted to try saving directly in ROM.