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 Post subject: Seagate ST1000DM003 No TTL Output
PostPosted: January 4th, 2019, 21:50 
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Joined: January 4th, 2019, 21:30
Posts: 9
Location: Between my keyboard and chair
Hello,

I have a ST1000DM003 (FW: CC47) that won't show up in BIOS or anywhere else it is plugged in.
I tried to connect it to my TTL adapter and if I wait 10-15 minutes when I press keys I then get odd garble for each key-press (CTRL+Z for example).

I tried another working ST1000DM003 (FW: CC62) I get the same behavior, no initial terminal output, then garble for each key-press.
Attachment:
File comment: One block of garble output per key-press.
terminal-no-output.png
terminal-no-output.png [ 2.9 KiB | Viewed 259 times ]


When I try to connect these drives to a terminal, with a piece of paper blocking the head connector, both of them will spin up, then after 5-10 seconds the platters will stop receiving power.

Is there something with this model that needs to be done to get the terminal to work correctly?
I read somewhere that shorting the read channel can get the terminal to spring to life, would that apply in my particular case?

As a sanity check I tried a ST3250318AS (FW: CC6B) and the terminal, with the standard commands, works perfectly so I know it isn't my TTL adapter.
When I connect this working drive it will spin up and stay that way until I provide CTRL+Z, as expected.

This leads me to believe that the terminal for the ST1000DM003 is just broken/different in some way.

Thoughts?


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 Post subject: Re: Seagate ST1000DM003 No TTL Output
PostPosted: January 4th, 2019, 23:56 
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Joined: September 8th, 2009, 18:21
Posts: 11075
Location: Australia
Measure the voltages at the Tx & Rx pins of the HDD. If they are 1.8V LVTTL, then that could be the problem.

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 Post subject: Re: Seagate ST1000DM003 No TTL Output
PostPosted: January 5th, 2019, 0:40 
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Joined: January 4th, 2019, 21:30
Posts: 9
Location: Between my keyboard and chair
I am reading 1.8v between either TX/RX to GND.

Any ideas on how to work with this?


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 Post subject: Re: Seagate ST1000DM003 No TTL Output
PostPosted: January 5th, 2019, 0:59 
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Joined: September 8th, 2009, 18:21
Posts: 11075
Location: Australia
Try this Kindle level shifter:

https://www.mobileread.com/forums/showthread.php?p=1897643

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 Post subject: Re: Seagate ST1000DM003 No TTL Output
PostPosted: January 5th, 2019, 4:27 
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Joined: January 4th, 2019, 21:30
Posts: 9
Location: Between my keyboard and chair
I made a level shifter from that link you provided and it works perfectly.

For reference I used 1N4148 diodes and 22K resisters.
Attachment:
File comment: Front side
IMG_20190105_002407.jpg
IMG_20190105_002407.jpg [ 2.93 MiB | Viewed 224 times ]

Attachment:
File comment: Back side
IMG_20190105_002417.jpg
IMG_20190105_002417.jpg [ 2.77 MiB | Viewed 224 times ]

Thanks!!

I will start another thread for the hard drive diagnostics should I have any trouble there.


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 Post subject: Re: Seagate ST1000DM003 No TTL Output
PostPosted: January 5th, 2019, 5:51 
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Joined: June 16th, 2018, 12:09
Posts: 55
Location: Turkey
I have tried to connect with USB TTL before. But a few connection gave me a result. Mostly has error like that or nothing on screen.

Now I am using MRT connector. I understand now that problems.

Some hdd won't connect to terminal properly. Whether you had a right connect.
I cannot join to terminal with MRT also. Still don't know what is the solution )).
Problem about HDD not connection.

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 Post subject: Re: Seagate ST1000DM003 No TTL Output
PostPosted: January 5th, 2019, 16:46 
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Joined: December 19th, 2006, 8:49
Posts: 10322
Location: Portugal
To avoid this "problem" and maximize compatibility one should chose a TTL adaptor based on the CP2104 chip ...

http://www.hddoracle.com/viewtopic.php?f=46&t=192

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