Taken from DonorDrives:
Western Digital Caviar 1st Edition
These are generally drives that are 10 or more years old. They can be differentiated by having a PCB that is, more or less, square compared to the L-shaped PCBs of later models.
Use the following criteria to find a donor drive.
Model number: Match the entire first part of the model number as well as three characters in the second part. Eg: WD800BB-55JKA0 Heads map: Match the physical heads (PH) map exactly. It is OK if the donor has more heads than the original drive, but all heads before that should match. DCM: Locate the J or 2 in the DCM. It should be towards the end. Make sure that the J or 2 as well as the preceding character matches on the donor. Country of manufacture: Should be the same. Date of manufacture: Should be within three months — the closer the better. Serial number: Match the first four digits of the serial numbers. PCB Revision: The PCB Rev should be the same.
Marvell (version 1)
These drives can be identified by the family code in the model number (the 3rd and 4th digits after the hyphen). The following families are part of this type: Mammoth (family codes EY, EZ, FA, FC, FJ, FM, HE, HF, JE, JS, JT, JY), Sabre (JH, JJ, JK, JL, JM, JN, JP, JR, JU, KS, LN, MG), Hawk (MH, MJ, MK, ML, MV, MW, MY, MZ, NC, ND, NE, NF, NG, NH, NJ, NK, NT, NV, NY, PA), Hawk-2 (SG, SH, TG), Starling (RD, RE, RF, RJ, RK, RL), Buccaneer (KE, KF, KG, KM), Zeus (MN, MP, VJ), and Raider (PC, PD, PE, PF, PG). Even if these families of drives say "Caviar SE" on the label, they belong to the Marvell architecture.
Use the following criteria to find a donor drive.
Model number: It is ideal to match the whole model number, but if none is available you can try one that matches the entire first part of the model number as well as these three characters in the second part: WD1600JB-40TGB0 Heads map: Match the physical heads (PH) map exactly. It is OK if the donor has more heads than the original drive, but all heads before that should match. DCM: Locate the J or 2 in the DCM. It should be towards the end. Make sure that the J or 2 as well as the preceding character matches on the donor. If the three characters before that match as well, it will have an even better chance of being a match. Date of manufacture: Should be within three months — the closer the better. Preamplifier: Exact match for both vendor and revision. Microjogs: Each value should be within 300 of the original drive — the closer the better. Country of manufacture: Should be the same.
Marvell (version 2)
These encompass most newer and modern Western Digital drives.
Use the following criteria to find a donor drive.
Model number: It is ideal to match the whole model number, but if none is available you can try one that matches the entire first part of the model number as well as these three characters in the second part: WD1200BEVT-22A23T0 Heads map: Match the physical heads (PH) map exactly. It is OK if the donor has more heads than the original drive, but all heads before that should match. DCM: Locate the J or 2 in the DCM. It should be towards the end. Make sure that the J or 2 as well as the preceding character matches on the donor. Preamplifier: Exact match for both vendor and revision. Microjogs: Each value should be within 200 of the original drive — the closer the better. Country of manufacture: Should be the same. Date of manufacture: Should be within three months — the closer the better.
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