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 Post subject: Directly Read Preamp from Seagate ROM Code
PostPosted: May 21st, 2018, 15:05 
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Joined: April 3rd, 2011, 0:19
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Location: Providence, RI
So I've been working on finding ways to quickly read preamp out from many different Seagate ROM codes. It's been a little project of mine. For families such as Grenada and Bacall as well as many others, I can now identify the preamp in just a few seconds with no need to do all the steps of modifying heatmap in PC-3000, running comparison, etc.

So if anyone needs help figuring out a preamp, just post the ROM code on this thread of my forum: https://www.data-medics.com/forum/seaga ... t2159.html

Please don't post the ROMs here as I may not always monitor this thread, especially after it gets pushed way down in the HDDGuru archives. But on my forum it's a Sticky topic and I'll continue to monitor it.

For now, I'll identify it as a favor to anyone who asks. At least while I'm still refining my technique.

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 Post subject: Re: Directly Read Preamp from Seagate ROM Code
PostPosted: May 23rd, 2018, 20:13 
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Joined: September 8th, 2009, 18:21
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Location: Australia
If anyone wishes to upload their ROM here, I'll have a go.

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 Post subject: Re: Directly Read Preamp from Seagate ROM Code
PostPosted: May 24th, 2018, 2:23 
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Joined: May 29th, 2011, 8:47
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Location: Russia
Preamp in not the only component to match. Sliders' type should coincide as well


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 Post subject: Re: Directly Read Preamp from Seagate ROM Code
PostPosted: May 24th, 2018, 16:20 
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I think I know how to visually identify the preamp type in all F3 ROMs, without the need to look up SAP offsets in a database. If I can confirm my method, I will post it here.

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 Post subject: Re: Directly Read Preamp from Seagate ROM Code
PostPosted: May 26th, 2018, 8:35 
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Joined: December 19th, 2006, 8:49
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Location: Portugal
fzabkar wrote:
I think I know how to visually identify the preamp type in all F3 ROMs, without the need to look up SAP offsets in a database. If I can confirm my method, I will post it here.


I think i can help you out with that later !

:D

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 Post subject: Re: Directly Read Preamp from Seagate ROM Code
PostPosted: May 26th, 2018, 9:12 
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Joined: April 3rd, 2011, 0:19
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Location: Providence, RI
It's not very difficult once you know what you're looking for. It's basically just a matter of knowing how to identify the location of the head map in ROM and then knowing what offset to look for based off of that location.

There are at least three (probably even more) different head map types I've seen but all are easy enough to recognize and find in a hex editor once you understand how it's written in the binary data.

I'd been meaning to figure this out years ago but never found the time until last week to really spend the time analyzing it. That's what happens when I finally get a slower week of work.

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