how to recover data from 2tb segate drive . there is no clicking sound and no noise . bios recognized only first time . after terminal command by pressing Ctrl+z = there is no response the model is st320000542as . firmware cc95

no i am send my drive with another company

how i can recover data from my self

If the drive doesn't produce any mechanical sound very likely your pcb is faulty, this explains why you don't get any response in terminal.
First you have to be sure that your TTL adapter is working good and check if the ground (GND) is in common with adapter, hdd, computer, power supply.
Check also that you have set terminal parameters properly.

If the pcb is faulty you have to swap it with a donor and transfer the ROM.

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My firmware database:
https://mega.nz/folder/O01DkBRI

i alredy check this method My Michael Brother

Upload a photo of the PCB. There may be an easy, no cost DIY fix.

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A backup a day keeps DR away.

SEgate pcb

but no firmware i have removed this firmware another pcb and there is no response in hard disk power but not detected

On the pcb picture are marked two points with a red circle, that are for the read channel, sometimes pcb have locked read channel so user can't work in terminal.
To enable the read channel you have to short those points at the right moment (few seconds after power supply has been applied).

P.S.
If you remove the ROM chip, or if it has not been installed properly, the drive will not spin! (you need to do a good soldering job to make it work).
If the installed ROM is not the original one of the drive, then the drive will spin but you would hear head clicking sounds and no BIOS detection!

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My firmware database:
https://mega.nz/folder/O01DkBRI

Test points ...

_________________
A backup a day keeps DR away.