How to find a Donor for head-swap on Samsung drives

[ACE_Admin]

From the old families before Victor, Puma, Verna & etc. ( Max capacity 120Gb, Max Head number 4 ) donor drive for Heads stack has to be chosen by the 4-th symbol on the side sticker which consist from 5 symbols. There are 3 versions of this sticker: xxxAx, xxxRx, xxxSx. 4-th symbol should match on patient and on donor drive, this symbol is responsible for this drive Heads stack manufacturer.

From the families like Palo, Magma, P80M, Delphi and other ( Max capacity 160Gb, Max Head number 4 ) to Poseidon family ( Max capacity 250Gb, Max Head number 4 ), the donor drive could be recognized by other symbols on the top sticker after P/V. There are 2 versions of such sticker: P\V: xS, P\V: xA. As you see the second symbol should be matched. Nowadays this sticker as P/V: xA does not exists on manufactured drives.

There are no symbols/codes responsible for Heads on the HDD stickers for Trident( T133(S)), T166(S), M60(S), M80(S) ) families . But the hard drive manufacturer started to use only "S ( SAE )" heads. So , for this families, the heads stack donor has to belong same family and its heads map should be the same as on patient.

In some situations, the head stack assembly from one family was compartible with the other family, the only condition was the density. For example: Patient drive - Palo (160Gb/4 Heads) and Donor drive Delphi (160Gb/4 Heads).
If there is no drive with same heads map, you can use the head stack assembly with greater number of heads (4 or 6 Heads for T133, T166 ). In this case the drive will ignore unused heads.

[DataStudio]

Yesterday I have found following issue with both donor and patient.
family VELOCE
model SV1203N
code P\V: MS, date 2003.10 and 2004.01

Patient has got 4 heads, donor has got 3 heads.
Heads map are diferent: 0,1,2,3 and 0,2,3

Seems like I need to find another donor, and there is a question for You.
Is there a way to determine according to label oranything else how many heads has got the HDD ?
I don't want to buy another one donor equipped with 3 heads

In manual, on Samsung chart there is also information that SV1203N has got 2 platters and 3 heads, so the question is how is it possible that one of them has got 4 heads?