WD400BB-77AUA1 - PCB dead !!!

[zebong]

Hi to all,

Have this disk WD400BB-77AUA1, when i connect to the udma it stays BSY forever.

So i found a similiar PCB

Patiente: 000 001003-001 G
Donor : 000 001003-000 C


When i change it , i could have ID, serial size, all the modules are ok in the utility, and i see two heads 0 1

head-test.jpg (9.49 KiB) Viewed 6989 times

I test the SA copy in the Composite reading , Copy 0 , Copy 1, and all the modules are green.

The info from service tracks i have this error but i think is normal for this model

Cyl -9; Head 0.......................... : Ok
WD Techno Read Error C/H/S: -9/1/280 Device Error Detected 59/40 (UNC)
.
.
WD Techno Read Error C/H/S: -9/1/327 Device Error Detected 59/40 (UNC)

Cyl -20; Head 0......................... : Ok
WD Techno Read Error C/H/S: -20/1/1 Device Error Detected 59/01 (AMN)
.
.
WD Techno Read Error C/H/S: -20/1/519 Device Error Detected 59/01 (AMN)
Cyl -20; Head 1......................... : Ok


When i start in DE and build the head maps it appear 3 Heads.

wd-head-map.jpg (4.5 KiB) Viewed 6991 times

i start to clone, and i just can clone 41 215 sectors, after disk it give error reading any sector


Anyone have an opinion about this.


Thanks
ZeBong

[Mikippp]

Hi,
This HDD will have 3 heads enabled...
PS Probably U use PCB from 20GB or 30GB donor...

Mikippp

[rameez]

change the ROM from original pcb to this donor pcb .

[zebong]

Thanks to all,

I prefer to try first just to write a ROM do the patient PCB.

Anyone have this ROM, WD400BB-77AUA1


Thanks
ZeBong

[Mikippp]

Hi,

When i change it , i could have ID, serial size, all the modules are ok in the utility, and i see two heads 0 1

U not need ROM...
U must enable more 1 head...

PS In this PCB ROM may be saved in Flash, or in Eprom...

Mikippp

[zebong]

Thanks Mikippp, the donor PCB was from a 20GB disk.

Can anoyone knows how much heads have this model ?

I enable one more head, and now in DE it appear 4 Heads.

Tomorow i will enable other Head, but would like to know if this model have 4 heads.


Thanks
ZeBong

[zebong]

Enable 4 Heads, and cloning 100%


Thanks Mikippp