I am trying to write a CD and I have
atapiscsi0 at pciide0 channel 1 drive 0
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <SAMSUNG, CDRW/DVD SN-324S, U303> SCSI0 5/cdrom
removable

man cdrecord says: "Some operating systems or SCSI transport implementations
may require to specify a filename in addition. In this case the correct syntax
for the device  is:  dev=  devicename:scsibus,target,lun[...]"

May OpenBSD require to specify a filename in addition?

If OpenBSD requires a filename in addition, does cdrecord have any further
requirements on the filename apart that it is somehow associated with the
writer in question? As dmesg suggests, I have a filename /dev/cd0a and
/dev/cd0c.

However, cdrecord dev=help suggests another filename:

Transport name:         SCIOCCOMMAND
Transport descr.:       SCSI for devices known by *BSD
Transp. layer ind.:     
Target specifier:       device or bus,target,lun
Target example:         /dev/rcd0a:@ or 1,2,0
SCSI Bus scanning:      not supported
Open via UNIX device:   supported

In this case it's filename /dev/rcd0a, which I have on my system, too.

So the possible values for dev= according to this "documentation" are so far
dev=0,0,0
dev=/dev/cd0a:0,0,0
dev=/dev/cd0c:0,0,0
dev=/dev/rcd0a:0,0,0

$ cdrecord dev=0,0,0 disk1.iso 
cdrecord: No write mode specified.
cdrecord: Asuming -tao mode.
cdrecord: Future versions of cdrecord may have different drive dependent 
defaults.
cdrecord: Continuing in 5 seconds...
Cdrecord-Clone 2.01 (i386-unknown-openbsd3.9) Copyright (C) 1995-2004 Jvrg 
Schilling
scsidev: '0,0,0'
scsibus: 0 target: 0 lun: 0
cdrecord: No such file or directory. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'.

$ cdrecord dev=/dev/cd0a:0,0,0 disk1.iso
[...]
cdrecord: Operation not supported by device. Cannot open '/dev/cd0a'. Cannot
open SCSI driver.
[...]

$ cdrecord dev=/dev/cd0c:0,0,0 disk1.iso
[...]
cdrecord: Operation not supported by device. Cannot open '/dev/cd0c'. Cannot
open SCSI driver.
[...]

$ cdrecord dev=/dev/rcd0a:0,0,0 disk1.iso
[...]
cdrecord: Operation not supported by device. Cannot open '/dev/rcd0a'. Cannot
open SCSI driver.
[...]

Seems like there exists at least one operation which is not supported by
these devices. But is it the write operation? Or something else? Does this
mean OpenBSD doesn't support writing on my unit? Or does it mean the cryptic
identifier I passed to dev= is just not cryptic enough?

CL<


OpenBSD 3.9 (GENERIC) #617: Thu Mar  2 02:26:48 MST 2006
    [EMAIL PROTECTED]:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: Intel(R) Pentium(R) M processor 1.50GHz ("GenuineIntel" 686-class) 1.50 
GHz
cpu0: 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,ACPI,MMX,FXSR,SSE,SSE2,SS,TM,SBF,EST,TM2
cpu0: Enhanced SpeedStep 1500 MHz (1340 mV) (not in table)
real mem  = 535052288 (522512K)
avail mem = 481202176 (469924K)
using 4278 buffers containing 26857472 bytes (26228K) of memory
mainbus0 (root)
bios0 at mainbus0: AT/286+(00) BIOS, date 01/28/05, BIOS32 rev. 0 @ 0xffe90
pcibios0 at bios0: rev 2.1 @ 0xf0000/0x10000
pcibios0: PCI IRQ Routing Table rev 1.0 @ 0xfc590/176 (9 entries)
pcibios0: PCI Interrupt Router at 000:31:0 ("Intel 82371 ISA and IDE" rev 0x00)
pcibios0: PCI bus #2 is the last bus
bios0: ROM list: 0xc0000/0xd800! 0xcd800/0x800 0xce000/0x800 0xce800/0x800 
0xcf000/0x800 0xcf800/0x800
cpu0 at mainbus0
pci0 at mainbus0 bus 0: configuration mode 1 (no bios)
pchb0 at pci0 dev 0 function 0 "Intel 82852GM Hub-PCI" rev 0x02
"Intel 82852GM Memory" rev 0x02 at pci0 dev 0 function 1 not configured
"Intel 82852GM Configuration" rev 0x02 at pci0 dev 0 function 3 not configured
vga1 at pci0 dev 2 function 0 "Intel 82852GM AGP" rev 0x02: aperture at 
0xf0000000, size 0x8000000
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
"Intel 82852GM AGP" rev 0x02 at pci0 dev 2 function 1 not configured
uhci0 at pci0 dev 29 function 0 "Intel 82801DB USB" rev 0x01: irq 11
usb0 at uhci0: USB revision 1.0
uhub0 at usb0
uhub0: Intel UHCI root hub, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1 at pci0 dev 29 function 1 "Intel 82801DB USB" rev 0x01: irq 11
usb1 at uhci1: USB revision 1.0
uhub1 at usb1
uhub1: Intel UHCI root hub, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2 at pci0 dev 29 function 2 "Intel 82801DB USB" rev 0x01: irq 11
usb2 at uhci2: USB revision 1.0
uhub2 at usb2
uhub2: Intel UHCI root hub, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
ehci0 at pci0 dev 29 function 7 "Intel 82801DB USB" rev 0x01: irq 11
usb3 at ehci0: USB revision 2.0
uhub3 at usb3
uhub3: Intel EHCI root hub, rev 2.00/1.00, addr 1
uhub3: 6 ports with 6 removable, self powered
ppb0 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0x81
pci1 at ppb0 bus 1
cbb0 at pci1 dev 1 function 0 "Texas Instruments PCI4510 CardBus" rev 0x02: irq 
11
"Texas Instruments PCI4510 FireWire" rev 0x00 at pci1 dev 1 function 1 not 
configured
ipw0 at pci1 dev 3 function 0 "Intel PRO/Wireless 2100" rev 0x04: irq 11, 
address 00:0c:f1:61:60:36
fxp0 at pci1 dev 8 function 0 "Intel PRO/100 VE" rev 0x81, i82562: irq 11, 
address 00:11:43:52:46:e7
inphy0 at fxp0 phy 1: i82562ET 10/100 PHY, rev. 0
cardslot0 at cbb0 slot 0 flags 0
cardbus0 at cardslot0: bus 2 device 0 cacheline 0x8, lattimer 0x20
pcmcia0 at cardslot0
ichpcib0 at pci0 dev 31 function 0 "Intel 82801DBM LPC" rev 0x01: SpeedStep
pciide0 at pci0 dev 31 function 1 "Intel 82801DBM IDE" rev 0x01: DMA, channel 0 
configured to compatibility, channel 1 configured to compatibility
wd0 at pciide0 channel 0 drive 0: <HTS548040M9AT00>
wd0: 16-sector PIO, LBA48, 38154MB, 78140160 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 5
atapiscsi0 at pciide0 channel 1 drive 0
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <SAMSUNG, CDRW/DVD SN-324S, U303> SCSI0 5/cdrom 
removable
cd0(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 2
auich0 at pci0 dev 31 function 5 "Intel 82801DB AC97" rev 0x01: irq 11, ICH4 
AC97
ac97: codec id 0x83847650 (SigmaTel STAC9750/51)
ac97: codec features headphone, 20 bit DAC, 20 bit ADC, SigmaTel 3D
audio0 at auich0
isa0 at ichpcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
spkr0 at pcppi0
npx0 at isa0 port 0xf0/16: using exception 16
pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
biomask efed netmask efed ttymask ffef
pctr: 686-class user-level performance counters enabled
mtrr: Pentium Pro MTRR support
uhidev0 at uhub1 port 1 configuration 1 interface 0
uhidev0: Logitech USB-PS/2 Optical Mouse, rev 2.00/20.00, addr 2, iclass 3/1
ums0 at uhidev0: 3 buttons and Z dir.
wsmouse1 at ums0 mux 0
dkcsum: wd0 matches BIOS drive 0x80
root on wd0a
rootdev=0x0 rrootdev=0x300 rawdev=0x302
auich0: measured ac97 link rate at 48012 Hz, will use 48000 Hz

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