Whcih drive is which on IDE cable?

I have 2 identical (same make, model and size) hard disk drives on my
primary IDE channel - one master and one slave. I think I have worked
out that the C:drive is Disk 0 and the D:drive is disk 1. I want to
replace the D: drive but when I come to open the PC case, how do I
tell which is the D:drive?

I suppose I could determine this by trial and error (50:50 chance) but
I thought there must be a way of getting this right first time.

Thanks

Gordon

.

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