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HDD and family model used here: Hitachi DK23BA including DK23BA-60, DK23BA-10 and DK23BA-20. The following information is useful for those who start Hitachi hdd repair or data recovery services.

Features of this hard drive includes 17.2 GBits in; 6,10, 20 GB in 9.5mm high package for maximum capacity
slimline notebooks; ATA-5 interface with 512 kB or 2048kB read/write cache;  GMR head and MEEPRML read channel technology; 32-bit RISC microprocessor,  Shock sensor, SMART, etc.

In the PCB photo above, you can clearly see 4 chips marked 1, 2, 3, 4, they have different controls to how the drive works there:

1, Buffer RAM;

2, Read/Write Channel; Interface Circuit; Servo Control Circuit;

3, VCM Power AMP; Spindle Motor AMP;

4, Microprocessor (MPU): MPU RAM and MPU ROM

Buy Hitachi DK23BA Donor drives here for head/platter exchange or firmware backup and upgrade.

Best Hitachi hard drive repair tool recommended: HD Doctor for Hitachi

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