I ran into a similar problem when trying to install 5.3 RC1. I ended up installing 5.2.1 and then upgrading my source and rebuilding everything to get to 5.3-Stable. If I boot normally, I receive several errors on my DVD drive and I am unable to mount any kind of media (CD-R, CD, DVD-RW). However, if I boot verbosely, I get no errors and everything mounts fine. Any ideas on what might be going on? I am downloading 5.3-STABLE-20041116 to see if any changes may have fixed this problem. Thanks, -Matt Copyright (c) 1992-2004 The FreeBSD Project. Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. FreeBSD 5.3-STABLE-20041109-JPSNAP #6: Mon Nov 15 17:24:31 UTC 2004 root@host.com:/usr/obj/usr/src/sys/MODULAR ACPI APIC Table: <DELL GX260 > Timecounter "i8254" frequency 1193182 Hz quality 0 CPU: Intel(R) Pentium(R) 4 CPU 2.26GHz (2258.31-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0xf27 Stepping = 7 Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> # Booting normally acd0: FAILURE - MODE_SENSE_BIG timed out acd0: FAILURE - MODE_SENSE_BIG timed out acd0: FAILURE - MODE_SENSE_BIG timed out acd0: FAILURE - MODE_SENSE_BIG timed out acd0: FAILURE - MODE_SENSE_BIG timed out acd0: CDROM <NEC DVD+RW ND-1100A/10GE> at ata0-slave UDMA33 acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - PREVENT_ALLOW timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - PREVENT_ALLOW timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - PREVENT_ALLOW timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - PREVENT_ALLOW timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - PREVENT_ALLOW timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - PREVENT_ALLOW timed out # Attempting to mount returns: 'cd9660: /dev/acd0: Input/output error' acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - PREVENT_ALLOW timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - PREVENT_ALLOW timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - PREVENT_ALLOW timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - PREVENT_ALLOW timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - TEST_UNIT_READY timed out acd0: FAILURE - PREVENT_ALLOW timed out # Booting verbose acd0: stat=0x00 err=0x01 lsb=0x14 msb=0xeb acd0: pio=0x0c wdma=0x22 udma=0x42 cable=40pin acd0: setting PIO4 on Intel ICH4 chip acd0: setting UDMA33 on Intel ICH4 chip acd0: FAILURE - MODE_SENSE_BIG timed out acd0: <NEC DVD+RW ND-1100A/10GE> CDRW drive at ata0 as slave acd0: read 6890KB/s (6890KB/s) write 2755KB/s (2755KB/s), 2048KB buffer, UDMA33 acd0: Reads: CDR, CDRW, CDDA stream, DVDROM, DVDR, packet acd0: Writes: CDR, CDRW, test write, burnproof acd0: Audio: play, 256 volume levels acd0: Mechanism: ejectable tray, unlocked acd0: Medium: