I have added a Sony SDX-420 ATAPI tape drive to a FreeBSD 5.2.1-RELEASE system.
The following is part of the kernel build:

# ATA and ATAPI devices
device          ata
device          atadisk                 # ATA disk drives

device atapicam

# SCSI peripherals
device          scbus           # SCSI bus (required for SCSI)
device          sa              # Sequential Access (tape etc)
device          cd              # CD

dmesg includes:

GEOM: create disk ad0 dp=0xc43f8760
ad0: 114473MB <ST3120026A> [232581/16/63] at ata0-master UDMA100
GEOM: create disk cd0 dp=0xc44e7600
sa0 at ata1 bus 0 target 0 lun 0
sa0: <SONY SDX-420C 0101> Removable Sequential Access SCSI-2 device 
sa0: 3.300MB/s transfers
SMP: AP CPU #1 Launched!
cd0 at ata1 bus 0 target 1 lun 0
cd0: <SONY CD-RW  CRX175A1 5YS3> Removable CD-ROM SCSI-0 device 
cd0: 3.300MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present

A dump appears to work:

monster# mt rew
monster# dump -ua0 -b64 /usr
  DUMP: WARNING: should use -L when dumping live filesystems!
  DUMP: Date of this level 0 dump: Mon Jun 14 18:45:49 2004
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/ad0s1f (/usr) to /dev/sa0
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 1668552 tape blocks.
  DUMP: dumping (Pass III) [directories]
  DUMP: dumping (Pass IV) [regular files]
  DUMP: DUMP: 1800569 tape blocks on 1 volume
  DUMP: finished in 262 seconds, throughput 6872 KBytes/sec
  DUMP: level 0 dump on Mon Jun 14 18:45:49 2004
  DUMP: Closing /dev/sa0

But restore does this:

monster# mt rew
monster# restore -t -b 64
Mount tape volume 2
Enter ``none'' if there are no more tapes
otherwise enter tape name (default: /dev/sa0) none
Tape read error while trying to resynchronize
continue? [yn] y
continuation failed: Bad file descriptor

I have tried quite a number of differing things...

Any hints or suggestions welcome.

Ray Newman
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