01010101100110101010110011010101011001101010101100110101010110011010101011001101010101100110
1001101010101100110101010110011010101011001101010101100110101010110011010101011001101010101100110101010110110101010
11
10101010110011010101011011010101001101010100110101101101101010100101
1011010101100110011010101011010101111010111
11010101101101010100111110
1101110110110011
0111011110
111101
011
11
1
PC-3000 EXPRESS / UDMA / PORTABLE Seagate
ACE Lab F3 architecture
Technical support: ts@acelab.ru
Phone: +7 863 201 50 06
ts.acelaboratory.com 57
12. Appendix 4. Selecting a donor heads stack
To select a suitable donor heads stack, the following criteria should be used:
♦ Names of the donor and patient drives must match to ensure that the drive family and the number of used
magnetic heads are the same
1
.
♦ The number of magnetic heads and their map in the patient and donor drives must match.
♦ To test suitability of the donor heads, install the original controller board from the patient drive onto the
potential donor HDA, switch on the power and watch over the start of the produced "hybrid" device. If the
HDD produces strong and quick knocking sounds with the heads and stops the spindle motor, these heads
are incompatible. If the drive does not stop and recalibration attempts are noticeable, you can try using the
set as a donor part. Unfortunately, success cannot be guaranteed in all cases because the parameters of
heads vary widely not only between different HDD, but even within a single magnetic heads stack. Still,
the heads stack selected using this method will have the highest chance of compatibility.
Attention! Back up the ROM content prior to any modification! ROM contains unique settings of the drive, their loss
or corruption will result in irreversible damage to the HDD.
1
Smaller drives belonging to the same family may be used, but in that case you will have to perform additional steps
for modification of information in ROM and some work with the HDA mechanics. If you have no successful
practical experience of such operations, using donor HDD with fewer magnetic heads than in the patient drive is
strongly discouraged.
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