Hard - and Software

 

IDE HDD boot switch

 

 

 

 

For testing programs on different OS platforms, its useful to have the ability to boot from different hard drives. In many solutions the data cable is cut and the master / slave signal is crossed via a switch.

My solution

The selection between hard drives is done by master / slave jumpers. Remove the jumpers an connect a 2pin connector instead On the connector solder a cable, on the other side of the cable solder a switch. This switch selects the master /slave.

this solution has the advantage, not to cut the hdd cable. Disadvantage, there is no standard jumper assignment.

Sample for  2 equal  HDD's (SV6004H)

This type can be set to 32Gb clipping. In my case I don't use the 32Gb clipping, which means jumper 3 - 4 has to be shortened. With the jumpers 1 - 5 resp. 1 - 2 the master / slave is selected

Connection HDD 1 The common pin of the switch is connected to HDD pin1, the NO pin is connected to HDD pin 2 and the NC pin is connected to HDD pin 5.

Connection HDD 2  The common pin of the switch is connected to HDD pin1, the NO pin is connected to HDD pin 5 and the NC pin is connected to HDD pin 2

Some hdd's  have both jumpers in vertical direction, in that case find the gnd pins, the opposite pin is  the master / slave pin which is selected by the switch.

 

 

IDE hdd boot select switch