Fujitsu MJA2500BH Maintenance Manual - Page 84
Hot Plug, It is recommended to choose the minimum value which is in permissible range
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Interface 5.1.6 Hot Plug The disk drive is "Hot Plug Capable" which is based on Serial ATA Revision 2.6. It is recommended to use the pre-charge resistor for protection from over current at +5V power supply circuit in the host system when the disk drive is hot-plugged. (Refer to the Serial ATA Revision 2.6.) The equivalent circuit of +5V power supply at Hot Plugging is in the following figure. It is necessary to choose pre-charge resistor RL value, which is in permissible range of +5V power supply specification at the host system. Refer to the equivalent circuit when the optimized value of pre-charge resistor RL. It is recommended to choose the minimum value which is in permissible range of +5V power supply specification at the host system. Because it is possible that rush current occurs again when P8, P9 pin connection after P7 (+5V pre-charge pin) connection dependent on the insertion speed. 5-10 C141-E293