Seagate 1TB ST31000524AS with Firmware JC45.

HDD is not detected.

No messages in Terminal Window even Rom Boot msg.

Can read and write rom via MRT without problem.

Changed PCB no use. The same pcb gives terminal msg with CC4? firmware( for testing) but not with JC45.

What is the problem?

Here attached the ROM copy.

Bootfirmware cann't read SA. In CC4x, the main code is in ROM, in JC45 - on platters.

Thx for your info.

There are 2 hdds with same problem.

Tried one hdd by changing logical headmap to 00 00 00 00 then hdd shows terminal msg and get ready can read system files.

In another hdd did same then hdd stays spin without strange Noise and get ready but no terminal msg and no ID

Thank you