excuse me miss dili man siguro "jumper" term anang gi pasabot nimo I think "IDE Cable na sya" you can buy that to any computer suppliers.
EDIT:
WARNING: Please turn off your PC before ka mo proceed aning mga steps.
So ang imong PC ron mao ni setup.
1 IDE Cable connected to your CDRW (Slave) and HDD (Master). HDD = Hard Disk Drive
This is the IDE Cable
And your question is to have another HDD as a Slave?
Owkie kung wala kay lain IDE Cable you can slave your Other HDD using the same cable where your CDRW pluged in. What you need to do is to remove the IDE naka saksak sa imong CDRW, then e taod na sya sa imong lain nga HDD then remove the jumper (pic 1 sa ubos) from your HDD so that it will act as slave drive (please check sa imong HDD naay mga drawing like pic2) dont forget to plug also the power supply to your HDD (slave) same gihapon naka saksak sa imong master HDD (master).
pic 1 sample only
pic 2 sample only.
sige miss goodluck, kung ganahan ka e taod nimo ug balik ang CDRW e saksak lang balik ang IDE Cable niya, and you need to remove your other slave HDD. Aron di na hasol buy another IDE ha? tag 20pesos raman siguro na.