Can I plug a 2nd hard-drive in the slot for the CDROM drive?

Chances are your optical drive is secondary slave, so you can plug the hard drive into the same cable that the optical drive is connected to (

HDD SATA slot Check manufacturer specs or open the laptop using It is better to buy

hard drive slot Schneider Electric India HMIBUHND1P01 - Box PC Universal - Hard Disk - DC - 1 slot

harden creek slot cars It provides information on installed drives not the actual number of slots the machine has the slot number associated with the installed hard