HDD GURU FORUMS

islamm3rouf wrote:need toshiba 2tb rom

nice idea

islamm3rouf wrote:hdd cam without pcb

good luck

BTW IMHO you shouldn't take others drives and mess with it

What jermy is trying to say is that without the original PCB there's absolutely no possibility to recover the data.

The fact that you don't know that shows that you're unqualified to be offering data recovery services.

islamm3rouf wrote:i test other same pcb with soft
it spin without clicking and sound seems good
but identify with the donor sn
so i was thinking if we found donor soft it will rise again

Already answered you. Without original ROM no recovery is possible.

pclab wrote:Without original ROM no recovery is possible.

Does anyone know why? Which CPs are mandatory and what do they do?

FWIW, I have analysed the structure of various Toshiba CPs here:

Analysis of Toshiba CPs:
http://www.hddoracle.com/viewtopic.php?f=59&t=2044

fzabkar wrote:Does anyone know why? Which CPs are mandatory and what do they do?

Because all the CPs except basically the G-List and S.M.A.R.T. are stored in the ROM chip. There's very little on the platters for a service area at all.

While it might be theoretically possible to rebuild the translator, p-list, etc. from scratch it's not practical in the real world. Maybe if deepest Russian secrets were stored on a drive it'd be worth the crazy amount of manual effort, but not for a typical case.

data-medics wrote:

fzabkar wrote:Does anyone know why? Which CPs are mandatory and what do they do?

Because all the CPs except basically the G-List and S.M.A.R.T. are stored in the ROM chip. There's very little on the platters for a service area at all.

While it might be theoretically possible to rebuild the translator, p-list, etc. from scratch it's not practical in the real world. Maybe if deepest Russian secrets were stored on a drive it'd be worth the crazy amount of manual effort, but not for a typical case.

I understand where the CPs are stored, I just don't understand what they do. In fact some Toshiba models do have copies of some ROM based CPs in the SA, although you would need to reach the SA to make use of them. Catch 22.

If I were investigating this issue, I would "disturb" a particular CP and observe the sensitivity to these disturbances. That is, I would vary a particular CP parameter in both directions and determine the range over which the drive remains stable.