Second hard disk on notebook warning "same ATA channel"

[TheSteve87]

I recently bought a caddy drive to add a second hd to my HP laptop removing the dvd drive; i tried it with an old hd that i wanted to rescue with the program HDD regenerator, and i got a warning popup saying that the two drives are using the same ATA channel: what does that mean? How can i solve this problem?

 

[Phillip Corcoran]

When two IDE-ATA drives are sharing one channel, one must be configured as "Master" (your Windows boot drive) and the other must be configured as "Slave" (the old drive you've added).

Remove the old drive.
Place the jumper at the back of the drive to the "Slave" position.
Put the drive back.

 

[TheSteve87]

When two IDE-ATA drives are sharing one channel, one must be configured as "Master" (your Windows boot drive) and the other must be configured as "Slave" (the old drive you've added).

Remove the old drive.
Place the jumper at the back of the drive to the "Slave" position.
Put the drive back.

can you explain me how to do this step by step, please? it's something i can set from windows or in the bios?

EDIT: i have to admit i didn't have idea about what a jumper is and i googled it, is it something i can still do on my laptop without having to disassemble it badly? can i just buy a bag of jumpers from ebay, put one on th efirst disk, one in the second and that's all?

EDIT2: after more googling it seems that the 4 pins on 2.5" sata drives can't be used to set the drive as master/slave actually.

Any other suggestion?