Hi everyone,
this is my first time dealing with an issue like this so please bear with me if I seem clueless.

I have a seagate barracuda st2000dm001 I use for backup that I thought was working fine until I updated the drivers for a PCI USB card I have and rebooted , at which point the drive disappeared from my OS.

I was able to access it through device manager but the read and write speed was incredibly slow, constantly dropping to 0kb/s.

Reinstalled SATA drivers etc. nothing I did helped it, and at this point the drive wasn't even being detected by my BIOS.
I also started noticing that the computer would be very slow to boot or go into the BIOS. (and realized that this has been happening off and on for a few months now)

Anyways, I uninstalled the USB drivers and the harddrive showed in the BIOS once, but after starting Windows it was gone. At this point the drive cannot be detected at all.

I have no idea where to even start. How can I get a diagnostic of the issue if nothing can detect the drive? It seems to spin and isn't making any funny noises. I'd really prefer not to lose the data I have on there.

any guidance would be very appreciated.

I would suggest to go to pro if you need data. This model likes to scratch surfaces by heads and if it happened even for pro will be difficult to get data from drive. So do not lose time and possibility to recover data.

I appreciate the advice. Is there anything I can do myself to at least know what the problem is? Not being able to diagnose it in any way is what's really bothering me here

As drHDD suggested already, if

Then seek pro help

But if you prefer the DIY route regardless the outcome that can lead to... then

terminal log can be a good start

Thank you. Would I need special hardware to do this since the drive is not being recognized in the BIOS at all?

Yes, a terminal adapter. Something like this would do: http://www.ecrater.com/p/15286631/pc-30 ... 2511193139

But, be aware that you'll likely still end up needing pro recovery. In all liklihood you're just delaying the inevitable and decreasing the chance recovery will be possible later. If the drive is clicking or making any other strange noise you shouldn't even power it on to try anything.

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Data Medics - Hard Drive, SSD, and RAID Data Recovery Service Company

Thanks I appreciate it. Looks like a lost cause since I wouldn't be willing to pay too much to recover it. I'll just hang onto the drive in case some magic way of easily getting the data off is ever invented in the future

I actually have an update. I bought an external USB enclosure and it seems to detect the harddrive when using that. It took almost 20 minutes to load in windows explorer though, so it seems to be spotty at best. I'm going to try and pick off as many files as I can, maybe I can get some diagnostic tools to run on it now.

What number is too much for you?
Right now I think it's possible to recover your data for $100-$200. But if you will try to continue to do recovery without tools and knowledge - numbers will go to $500-$1000 and etc.