Hello gurus,

What drive do you suggest to use for parts for the following segate drive?

I got the following drive: ST3320418AS 7200.12 320GB PN:9SL14C-515 FW:CC44 Data Code: 10377 -> 19.3.2010 .
I ordered 3 sets from eBay for that drive and used a friend's technique for finding the preamp version. pressing on terminal CTRL + L.
Since the drive has bad heads and I couldn't reach Ready state I isolated the motor connections with a piece of paper and got the terminal access. This is what I got from the terminal.

F3 T>
HighPowerMode
New Skews Pharaoh 0F with VTPI,RAP16,Common Code 4
Product FamilyId: 3F, MemberId: 05
HDA SN: 5VM9GB07, RPM: 7201, Wedges: 120, Heads: 2, Lbas: 2542EAB0, PreampType: 59 04
PCBA SN: 0000M034U3X2, Controller: YETIST_3_0(649B)(3-12-3-3), Channel: AGERE_COPPERHEAD_LITE, PowerAsic: MCKINLEY DESKTOP LITE Rev 15, BufferBytes: 1000000
Package Version: PH0G2D.CCD4.CT0C2H., Package P/N: 100597861, Package Builder ID: AT,
Package Build Date: 10/21/2009, Package Build Time: 14:16:57, Package CFW Version: PH0G.CCD4.00215571.AT00,
Package SFW1 Version: D24D, Package SFW2 Version: ----, Package SFW3 Version: ----, Package SFW4 Version: ----
Controller FW Rev: 10211416, CustomerRel: CC44, Changelist: 00215571, ProdType: PH0G.CCD4, Date: 10/21/2009, Time: 141657, UserId: 00236537
Servo FW Rev: D24D
RAP FW Implementation Key: 10, Format Rev: 0001, Contents Rev: A1 09 08 03
Features:
- Quadradic Equation AFH enabled
- VBAR with adjustable zone boundaries enabled
- Volume Based Sparing enabled
- IOEDC enabled
- IOECC enabled
- DERP Read Retries enabled
- LTTC-UDR2 compiled off

Then I checked the 3 drives which I got. The 3 drives have the same model, FW, Capacity and only difference is the date code.
Those are the output from each of the 3 drives:
First donor drive:

Rst 0x10M
(P) SATA Reset
PASS
RW: Error processing Performance Parameter File: 203C
Send Status: COMRESET seen
ASCII Diag mode

F3 T>
ASCII Diag mode

F3 T>
New Skews Pharaoh 0F with VTPI,RAP16,Common Code 4
Product FamilyId: 3F, MemberId: 05
HDA SN: 5VM47D9X, RPM: 7201, Wedges: 120, Heads: 2, Lbas: 2542EAB0, PreampType: 73 21
PCBA SN: 0000E016M9X9, Controller: YETIST_3_0(649B)(3-12-3-3), Channel: AGERE_COPPERHEAD_LITE, PowerAsic: MCKINLEY DESKTOP LITE Rev 94, BufferBytes: 1000000
Package Version: PH0G2D.CCD4.CT0B2H.CC44 , Package P/N: 100592636, Package Builder ID: AT,
Package Build Date: 09/16/2009, Package Build Time: 13:16:57, Package CFW Version: PH0G.CCD4.00204341.AT00,
Package SFW1 Version: D24D, Package SFW2 Version: ----, Package SFW3 Version: ----, Package SFW4 Version: ----
Controller FW Rev: 09161316, CustomerRel: CC44, Changelist: 00204341, ProdType: PH0G.CCD4, Date: 09/16/2009, Time: 131657, UserId: 00236537
Servo FW Rev: D24D
RAP FW Implementation Key: 10, Format Rev: 0001, Contents Rev: A1 09 08 03
Features:
- Quadradic Equation AFH enabled
- VBAR with adjustable zone boundaries enabled
- Volume Based Sparing enabled
- IOEDC enabled
- IOECC enabled
- DERP Read Retries enabled
- LTTC-UDR2 compiled off

Second donor drive:
Rst 0x10M
(P) SATA Reset
PASS
RW: Error processing Performance Parameter File: 203C
Send Status: COMRESET seen
ASCII Diag mode

F3 T>
New Skews Pharaoh 0F with VTPI,RAP16,Common Code 4
Product FamilyId: 3F, MemberId: 05
HDA SN: 9VM3H2NM, RPM: 7201, Wedges: 120, Heads: 2, Lbas: 2542EAB0, PreampType: 73 01
PCBA SN: 0000C006F569, Controller: YETIST_3_0(649A)(3-12-3-2), Channel: AGERE_COPPERHEAD_LITE, PowerAsic: MCKINLEY DESKTOP LITE Rev 94, BufferBytes: 1000000
Package Version: PH0G2D.CCD4.CT092H.CC44 , Package P/N: 100578641, Package Builder ID: AT,
Package Build Date: 06/19/2009, Package Build Time: 14:43:42, Package CFW Version: PH0G.CCD4.00175857.AT00,
Package SFW1 Version: D248, Package SFW2 Version: ----, Package SFW3 Version: ----, Package SFW4 Version: ----
Controller FW Rev: 06191443, CustomerRel: CC44, Changelist: 00175857, ProdType: PH0G.CCD4, Date: 06/19/2009, Time: 144342, UserId: 00236537
Servo FW Rev: D248
RAP FW Implementation Key: 10, Format Rev: 0001, Contents Rev: A1 09 08 03
Features:
- Quadradic Equation AFH enabled
- VBAR with adjustable zone boundaries enabled
- Volume Based Sparing enabled
- IOEDC enabled
- IOECC enabled
- DERP Read Retries enabled
- LTTC-UDR2 compiled off

Third donor drive:
Rst 0x10M
(P) SATA Reset

ASCII Diag mode

F3 T>
New Skews HP_PSG Pharaoh 0F with VTPI,RAP16,Yeti 3.0
Product FamilyId: 3F, MemberId: 05
HDA SN: 5VM6F2JE, RPM: 7201, Wedges: 120, Heads: 2, Lbas: 2542EAB0, PreampType: 73 01
PCBA SN: 0000K02591L7, Controller: YETIST_3_0(649B)(3-12-3-3), Channel: AGERE_COPPERHEAD_LITE, PowerAsic: MCKINLEY DESKTOP LITE Rev 94, BufferBytes: 1000000
Package Version: PH0G2D.HPD1.EG016J.HP34 , Package P/N: 100593268, Package Builder ID: AT,
Package Build Date: 09/21/2009, Package Build Time: 14:18:08, Package CFW Version: PH0G.HPD1.00205461.AT00,
Package SFW1 Version: D23D, Package SFW2 Version: ----, Package SFW3 Version: ----, Package SFW4 Version: ----
Controller FW Rev: 09211418, CustomerRel: HP34, Changelist: 00205461, ProdType: PH0G.HPD1, Date: 09/21/2009, Time: 141808, UserId: 00236537
Servo FW Rev: D23D
RAP FW Implementation Key: 10, Format Rev: 0001, Contents Rev: A1 09 08 03
Features:
- Quadradic Equation AFH enabled
- VBAR with adjustable zone boundaries enabled
- Volume Based Sparing enabled
- IOEDC enabled
- IOECC enabled
- DERP Read Retries enabled
- LTTC-UDR2 disabled

As you can see each drive has difference preamp type than the patient drive.
But I found the same preamp type in a 250GB drive. Model: ST3250318AS P/N: 9SL131-302 FW: CC38 Date code10403 -> 05.04.2010.

Look at that:
RAW OFF
PASS
RW: Error processing Performance Parameter File: 203C
ASCII Diag mode

F3 T>
New Skews Pharaoh 0F with VTPI,RAP16,Common Code 3
Product FamilyId: 3F, MemberId: 05
HDA SN: 6VME2VNQ, RPM: 7201, Wedges: 120, Heads: 2, Lbas: 2542EAB0, PreampType: 59 04
PCBA SN: 0000K037CJKJ, Controller: YETIST_3_*/4_0(649B)(3-12-3-3), Channel: AGERE_COPPERHEAD_LITE, PowerAsic: MCKINLEY DESKTOP LITE Rev 94, BufferBytes: 800000
Package Version: PH0G2D.CCD3.FV0284.CC38 , Package P/N: 100618795, Package Builder ID: AT,
Package Build Date: 03/12/2010, Package Build Time: 15:06:33, Package CFW Version: PH0G.CCD3.00247208.AT00,
Package SFW1 Version: D26C, Package SFW2 Version: ----, Package SFW3 Version: ----, Package SFW4 Version: ----
Controller FW Rev: 03121506, CustomerRel: CC38, Changelist: 00247208, ProdType: PH0G.CCD3, Date: 03/12/2010, Time: 150633, UserId: 00236537
Servo FW Rev: D26C
RAP FW Implementation Key: 10, Format Rev: 0001, Contents Rev: A1 09 08 03
Features:
- Quadradic Equation AFH enabled
- VBAR with adjustable zone boundaries enabled
- Volume Based Sparing enabled
- IOEDC enabled
- IOECC enabled
- DERP Read Retries enabled
- LTTC-UDR2 disabled

What drive do you think should I use for heads swap?

I also checked few 500GB 7200.12 & 320GB 7200.11 drives and that what I got:
1) ST3500418AS 500GB 7200.12 PreampType: 59 24

2) ST3500418AS 500GB 7200.12 PreampType: 59 21

3) ST3500418AS 500GB 7200.12 PreampType: 73 03

4) ST3320613AS 320GB 7200.11 PreampType: 59 21

5) ST3500418AS 500GB 7200.12 PreampType: 59 21

Best Regards,