Probably something in the initrd si wrong. I will try to correct it in the next release. Now, if you do not like boot from CDROM, you can use the compactflash image on a USB Flash disk. You will use the SATA disk only to store the configuration and the logs.
If the USB ports of your system are USB 2.0, then Zeroshell will complete the bootstrap faster than with the cdrom.
Regards
Fulvio