Hitachi HDT721010SLA360 stays BSY

[rcz]

Hi,

Here is a Hitachi HDT721010SLA360 (1 Tb).
Drive seems to initialize but stays BSY. I tried to change PCB in importing NV-RAM, and to change head, drive stays BSY.
When I change PCB only, drive goes to DRD-DSC but "Err ABR" appeared (as NV-RAM is not original one), but I can access to modules who are all good except for SRST and NVRC.

What can be done for thic case ?

[admin]

Hi,

It seems that original NV-RAM has corruptions so the drive cannot initialize itself, there is NV-RAM recovery from NVRC module required.

We have figured out that SLA family has different offset of NVRC module.
This mistake is corrected in PC-3000 source code, will be fixed in the next version of software.
In the current SW version you can save the NVRC module manually.
It consists of 4 sectors by the offset 0xFE0602FC.

Here is an example of NV-RAM recovery from NVRC module on SLA family:

1. Save 8 bytes from USAG module by the offset 4h.
NVRC has a factory version so you have to change it to the USAG's version.

1_usag.png (95 KiB) Viewed 16723 times

2. Open service information objects item and dump the NVRC module by its real offset, it's size is 2kb (4h sectors)

2_NVRClocation.png (31.07 KiB) Viewed 16723 times

3. Select and copy all bytes of dumped data (CTRL+A, CTRL+C)

3_copyNVRC.png (125.98 KiB) Viewed 16723 times

4. Open again service information objects item and dump the NV-RAM

4_dumpNVRAM.png (106.4 KiB) Viewed 16723 times

5. Select and paste there data you've copied on step 3 (CTRL+A, CTRL+V), change 8 bytes by offset 4h to the data from the step 1 (in my example 5354364F4133374Dh ---> 5354364E41333142h), then click "write to hdd".

5_pasteNVRC.png (104.96 KiB) Viewed 16723 times

6. Restart the power and you should get access to user data.

[rcz]

Thanks Sasha, but it doesn't works, drive stays BSY, as with original NV-RAM.
One head of the donor seems to be very slow now, I think one head on the patient is bad too...
I think there is no way to initialize this disk to read with heads who are still good... If only hotswap could have worked with Hitachi's...

[AJ2008]

Thanks Sasha, but it doesn't works, drive stays BSY, as with original NV-RAM.
One head of the donor seems to be very slow now, I think one head on the patient is bad too...
I think there is no way to initialize this disk to read with heads who are still good... If only hotswap could have worked with Hitachi's...

Hotswap is possible in some sitations in Hitachi

[rcz]

in some sitations

Now you have to tell me more

[AJ2008]

Do you use msn/skype?

[rcz]

Yep -> rcztech

[rcz]

Solved. To close

[slack]

Hi,

I have one similar problem with one HDT721010SLA360 which remain BSY, possible head 0 weak, with head swap the result is the same still remain BSY.

If i unscrew the PCB it become DRD,DSC and after that i screw back and i continue in utility and i can read all the modules.

There are few modules which i can't read from head 0 but i can read all of them from head 1.

My final conclusion is that i need HOT SWAP, can somebody tell me how to try it?

Thanks.

[hassan]

Hello
you can find the answer in
Bad sectors in service area solution

viewtopic.php?f=30&t=7186

[slack]

Hello
you can find the answer in
Bad sectors in service area solution

viewtopic.php?f=30&t=7186

I used before this method but is not working in this case case

[slack]

The strange thing in my case is that i can read all SA but there is something wrong between SA and NVRAM.

I attached the SA Structure test