Data recovery and disk repair questions and discussions related to old-fashioned SATA, SAS, SCSI, IDE, MFM hard drives - any type of storage device that has moving parts
December 21st, 2023, 13:47
Hey Guys
Anyone willing to share how to hardware block the write channel on a MQ04ABF100.
I tested with a donor PCB yesterday with the two sets of lines from controller to connector.
I assumed the write channel is the line with voltage, but tried both set anyway.
After cutting the drives just hangs on BSY.
I repaired the lines after and the PCB boots up fine, so its not that I caused other damage cutting them.
Image attached of the lines cut and tested.
Not pretty as its was just an experiment.
Anyone willing to share?
Tim
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December 21st, 2023, 14:01
You need to find the Write Gate and disable it.
Here is a Seagate example:
https://www.hddoracle.com/viewtopic.php?p=22105#p22105"PA_WRE - write enable"
December 21st, 2023, 14:20
Thanks for the info.
Do you have any other examples of other PCB's?
We have 1000s in stock but not this one.
I am guessing it was a Seagate test PCB looking at the silkscreen.
December 21st, 2023, 14:27
December 21st, 2023, 14:33
fzabkar wrote:See the "-WG" test point on this old PCB (Write Gate, active low, top left corner, near cutout):
Many thanks.
I'm sure I probably have others with similar markings.
I will do some testing.
December 21st, 2023, 14:48
I just realized this is what Vlad was referring to in a previous post.
"HW block write channel (WG)"
December 21st, 2023, 17:00
December 21st, 2023, 17:11
Spooky, someone just sent me that one as well.
I am out of the country later tonight for a while so will pick this up when I get back.
If someone shares confidential info I won't post it unless they approve.
But hopefully we can work it out and share with everyone.
December 22nd, 2023, 6:12
Is it to avoide new heads writing to sa?
December 23rd, 2023, 7:11
Well,
How many drives have you really killed that you are searching for a hardware solution .Can some of my friends out here say really if a hardware solution is required .
January 1st, 2024, 11:41
ddrecovery wrote:Hey Guys
Anyone willing to share how to hardware block the write channel on a MQ04ABF100.
I tested with a donor PCB yesterday with the two sets of lines from controller to connector.
I assumed the write channel is the line with voltage, but tried both set anyway.
After cutting the drives just hangs on BSY.
I repaired the lines after and the PCB boots up fine, so its not that I caused other damage cutting them.
Image attached of the lines cut and tested.
Not pretty as its was just an experiment.
Anyone willing to share?
Tim
Hi bro <<
any update here ?
Thanks
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