I suggest that you put it as slave to the 30 Gb drive. Then have the CD-RW as master on your 2nd EIDE with the CD ROM as slave to that. Depending on your system configuration (OS, IEDE cables etc) a slow HD as slave (say ata - 66) may slow down a faster (say ata-100/133) HD. If you have win 98 and an older m'board then it may just be worth while putting the HDs as master on each EIDE cable. (I always have my systems set as originally described).