Once again about switching HDD in the computer. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Once again about switching HDD in the computer. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Computers

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Installation in the computer of two independent hard drives, selected manually, in addition to the advantages mentioned in the article by V. Geiman in "Radio", 2013, No. 8, p. 21 also eliminates HDD vibration caused by mechanical beats in the case of close disk rotation speeds, which accelerates HDD failure.

The idea embodied in the design proposed there is interesting, but the parts necessary for its manufacture (remote switch, opto-relay) turned out to be difficult to obtain, and a simpler device with the same properties had to be developed. It does not contain any scarce parts, in addition, the standby voltage of 5 V is not required, access to which is associated with a known risk of damaging the computer.

The scheme of the device is shown in the figure and does not require special explanations. The power connectors of HDD No. 1 (XS1) and HDD No. 2 (XS2) are connected to the computer power supply unit through contacts K1.1 and K1.2 of relay K1 and XP1 connector. At the moment the computer is turned on with the SA1 switch closed, the charging current of the capacitor C1, flowing through the diode VD1 and the relay winding, causes it to operate. Power is supplied to HDD No. 2. At the same time, +12 V is supplied to the relay coil through the VD2 diode, and the relay remains activated until the computer is turned off. No manipulations with the SA1 switch will affect its state.

Once again about switching HDD in a computer

If the computer is turned on with switch SA1 open, relay K1 remains in its original unoperated state and power is supplied to HDD #1, and capacitor C1 is charged through resistor R1. After a short period of time required to charge it, closing the SA1 switch will no longer trigger the relay and switch the HDD.

The device is assembled on the plug of the free compartment of the computer system unit. It is equipped with a switch SA1 type SWK-2, controlled by a key, which made it possible to protect HDD No. 2 from unwanted curiosity. The wiring harnesses with connectors XS1 and XS2 are taken from an unnecessary computer power supply. An IDE to SATA adapter can be used as the XP1 connector.

Relay K1 - JW2HN-DC9V with a winding resistance of 155 ohms. Since it is designed for a voltage of 9 V, and is connected to a voltage source of 12 V, the excess extinguishes the resistor R2. If you use a relay with a 12 V winding, this resistor must be replaced with a jumper. You can also use a 5 V relay. In this case, the resistor R2 is also not required if the positive terminal of the capacitor is moved from pin 1 to pin 4 of the XP1 connector, and the anode of the VD2 diode from pin 1 to pin 4 of the XS2 connector.

The contacts of the relay used instead of the above must be able to withstand the current drawn by the HDD in the +5 V and +12 V circuits. Any replacement may require the selection of capacitor C1, the capacity of which must be large enough to reliably operate the relay K1. Increasing the capacitance, you must correspondingly reduce the value of the resistor R1. Otherwise, the time will increase during which the untimely closing of the contacts of the SA1 switch can lead to the shutdown of HDD No. 1, which has already begun to work, and the inclusion of HDD No. 2.

Author: G. Zakomorny

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