You need to check your code: If there is no disc in your drive, do not issue a stop command (And probably some other commands too). Depending on your console, it might or might not cause a freeze. You should initialize the hardware, and then determine whether there is a valid disc inserted first. Only then should you attempt to control the hardware.
Originally Posted by AKuHAK
Unmodified SCPH-77006 with SM 3.6
SCPH-39006 with M-chip modchip, SCPH-10281 NA and refurb Seagate 80GB HDD
SCPH-10000 v1.00 with SCPH-10190 PCMCIA NA and SCPH-20400 HDD unit