My HDD shows in Device Manager but not in Disk Management!

kelper said:

The disk is not initialised!

View attachment 173809

Right-click where I have circled and select initialise. Now it will appear with a drive letter. You can format it in Disk Management or in File Explorer.

Click to expand...

Yes i did that and doing the Initialize , at almost towards the end of its job, it show an error.
"The request could not be performed because of an I/O device error"
How is this error showing itself.

supersonic said:

Yes i did that and doing the Initialize , at almost towards the end of its job, it show an error.
"The request could not be performed because of an I/O device error"
How is this error showing itself.

Click to expand...

That is the same thing that happened to me. One time I bought a new 16TB WD Elements external HDD on Amazon. When I first connected it, it said it needed it needed to be initialized. That seemed strange but I let Disk Management try to initialize the drive. Unfortunately, there was an error trying to do that. I returned the drive for a refund.

MisterEd said:

That is the same thing that happened to me. One time I bought a new 16TB WD Elements external HDD on Amazon. When I first connected it, it said it needed it needed to be initialized. That seemed strange but I let Disk Management try to initialize the drive. Unfortunately, there was an error trying to do that. I returned the drive for a refund.

Click to expand...

yeah i think i'll do that too. File for a replacement. Lot of head ache and no joy, i'll definitely return this.

I never had such a large disk but it might be that they require more power than smaller capacity to properly work. Not sure how to give them more power. Use a higher wattage PSU? In any case they are either incompatible with your computer or faulty. Just return it for a replacement or refund. If you have that option, you can take your computer to the store service department and ask them to make it work, assuming it's not faulty.

supersonic said:

Yes i did that and doing the Initialize , at almost towards the end of its job, it show an error.
"The request could not be performed because of an I/O device error"
How is this error showing itself.

Click to expand...

Please post a screenshot of this error message in its entirety.

How is it connected to your computer?

Most likely causes (in your situation)
SATA power issue (very common even with new drives)
Enterprise 12TB drives are picky about stable power.

Check:
Use a direct PSU SATA power lead (not adapters, not splitters if possible)
Avoid daisy-chained SATA power connectors if the PSU is older
Ensure no loose connector fit

A marginal 12V rail will produce exactly your symptom: detection but instant I/O failure.