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 Post subject: ST3750528AS
PostPosted: February 13th, 2020, 13:36 
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Joined: July 2nd, 2011, 14:16
Posts: 381
Location: England
Hi all,

Got a few of these of ebay as faulty drives and hooked them up to terminal to see what was happening and they seem to be fine. I get the

Quote:
Rst 0x20M
Servo Processor Is Reset.
RW: Disc Ctlr Initialization Completed.

ExecuteSpinRequest

(P) SATA Reset


But when I try to enter terminal through the ctrl + Z command, nothing happens. Its like terminal is locked or frozen. I saw a post about shorting the read channels, but is that what I need to do to get terminal to work.

I'm planning on selling the PCB boards anyway, so they look to be working, drives spin up and read, but looks like a ton of bad sectors in important areas of the disk to stop formatting, creating partitions and so on.

Many thanks
Shane


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 Post subject: Re: ST3750528AS
PostPosted: February 14th, 2020, 18:22 
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Joined: July 2nd, 2011, 14:16
Posts: 381
Location: England
Here are some images of the PCB. Which channels do I short to get terminal responding. Not sure if the read channels should be shorted to ground.

Attachment:
DSCN0102.JPG
DSCN0102.JPG [ 161.86 KiB | Viewed 389 times ]

Attachment:
DSCN0101.JPG
DSCN0101.JPG [ 195.26 KiB | Viewed 389 times ]


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 Post subject: Re: ST3750528AS
PostPosted: February 14th, 2020, 18:53 
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Joined: July 2nd, 2011, 14:16
Posts: 381
Location: England
I'm looking at the forums, wondering if this might need 1.8V to work, or its a low voltage board. Not sure if it is. I get the terminal information, but cannot Ctrl+Z into terminal. Its only locked on (P) SATA Reset. Any ideas?

My USB Serial adapter uses 3.3v I think.


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 Post subject: Re: ST3750528AS
PostPosted: February 14th, 2020, 19:38 
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Joined: September 8th, 2009, 18:21
Posts: 12171
Location: Australia
Tip: How to identify the Read Channel test points:
http://www.hddoracle.com/viewtopic.php?f=24&t=123

_________________
A backup a day keeps DR away.


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 Post subject: Re: ST3750528AS
PostPosted: February 20th, 2020, 9:42 
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Joined: July 2nd, 2011, 14:16
Posts: 381
Location: England
Thanks for that. I haven't done anything with the drive, it more like a hobby fix if I can, but one question still remains, is this terminal voltage on this PCB 1.8V OR 3.3V

I think it's 3.3V because I am able to see the drives output terminal results, but I cannot enter the terminal mode or send commands.

Also, do these drive run a self scan when sitting Idle. Hopefully that might map bad sectors in the system area if I leave it running.

Thanks for help
Shane


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