Sony PCV-RX480DS - Manual (Page 107)

CMOS Setup Options 93
Boot Screen
1. ATAPI CD-ROM [(displays installed drive)]
Disabled
2. Removable Device [Legacy Floppy]
LS120
ZIP-100
ATAPI MO
Disabled
3. IDE Hard Drive [(displays installed drive)]
Disabled
4. Other Boot Device [Disabled]
INT18 Device (Network)
SCSI Boot Device
Silent Boot [Enabled]
Disabled