I have 2x Seagate ST3000DM001, PN: 1CH166-301. Both have failed at the same time whilst in use in a Netgear ReadyNAS Ultra 4+. One day it started producing (continued) beeping noise and I powered it down. I took the drives out and placed one in a PC and when it starts up, it spins up fine and does 2 beeps before it appears to spin down.

HDD is recognised in POST but running SeaTools shows the HDD as unable to be communicated with. I even tried running the firmware upgrade from Seagate and the drive info in that said it failed to get a response from the HDD. I opened up the lid and it showed that heads had been parked so I quickly closed it back up again. Would anyone know if this could be a PCB, internal hardware/heads issue or firmware problem?

The other HDD has the same issues as well (but unopened).

Spindown is usually heads / media

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The curse of the DM series I see a lot of media damage on these.

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And since you opened the lid to take a peek, that made things $1000's times worse and killed any chances you had. Its recommended you do not power the drives at all now and tell the DR company it was opened.

However, if you opened the drive in a clean chamber then you should be okay. Probably overheating killed the heads.

Ah bugger this sucks What's really annoying is both drives failed at the same time which is why I didn't have everything backed up! Gah guess I'll have to fork out some coin then

How does the drive appear in BIOS/POST? Does it display its correct model number and capacity, or does the POST just recognise that something is attached to the port?

How does the other drive behave?

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At POST the model number is shown correctly but it fails the SMART check and says (HDD/SMART Error). The other identical HDD also behaves and shows the exact same symptoms as well ie. spins up correctly, 2 or three beeps then appears to spin down. Also shows in POST and has SMART error.