Table of Contents
USB flash drives can be used to share data among machines.
After attaching it we can see via dmesg(8) that it is
dmesg[...] sd0 at scsibus0 target 0 lun 0: <Kingston, DataTraveler 3.0, > disk removable sd0: fabricating a geometry sd0: 14755 MB, 14755 cyl, 64 head, 32 sec, 512 bytes/sect x 30218842 sectors sd0: fabricating a geometry [...]
Please note that the following commands will erase all the previous contents on the USB flash drive!
To initialize it we can write zeros in the first 1MB of the USB flash drive:
dd if=/dev/zero of=/dev/rsd0d bs=1m count=11+0 records in 1+0 records out 1048576 bytes transferred in 0.118 secs (8886237 bytes/sec)
Via fdisk(8) we can create a partition table. MS-DOS
partition and filesystem is supported by most operating systems
and devices that accept an USB disk, so let's update the
partition table (
-u), creating an MS-DOS
partition and set the new partition as active
fdisk -au sd0fdisk: primary partition table invalid, no magic in sector 0 fdisk: Cannot determine the number of heads Disk: /dev/rsd0d NetBSD disklabel disk geometry: cylinders: 14755, heads: 64, sectors/track: 32 (2048 sectors/cylinder) total sectors: 30218842, bytes/sector: 512 BIOS disk geometry: cylinders: 1023, heads: 255, sectors/track: 63 (16065 sectors/cylinder) total sectors: 30218842 Partitions aligned to 16065 sector boundaries, offset 63 Do you want to change our idea of what BIOS thinks? [n]
Partition table: 0: <UNUSED> 1: <UNUSED> 2: <UNUSED> 3: <UNUSED> Bootselector disabled. No active partition. Drive serial number: 0 (0x00000000) Which partition do you want to change?: [none]
0The data for partition 0 is: <UNUSED> sysid: [0..255 default: 169]
11start: [0..1881cyl default: 63, 0cyl, 0MB]
size: [0..1881cyl default: 30218779, 1881cyl, 14755MB]
bootmenu:  (space to clear)
Partition table: 0: Primary DOS with 32 bit FAT (sysid 11) start 63, size 30218779 (14755 MB, Cyls 0-1881/9/10) PBR is not bootable: All bytes are identical (0x00) 1: <UNUSED> 2: <UNUSED> 3: <UNUSED> Bootselector disabled. No active partition. Drive serial number: 0 (0x00000000) Which partition do you want to change?: [none]
Do you want to change the active partition? [n]
yChoosing 4 will make no partition active. active partition: [0..4 default: 4]
0Are you happy with this choice? [n]
yWe haven't written the MBR back to disk yet. This is your last chance. Partition table: 0: Primary DOS with 32 bit FAT (sysid 11) start 63, size 30218779 (14755 MB, Cyls 0-1881/9/10), Active PBR is not bootable: All bytes are identical (0x00) 1: <UNUSED> 2: <UNUSED> 3: <UNUSED> Bootselector disabled. First active partition: 0 Drive serial number: 0 (0x00000000) Should we write new partition table? [n]
Then we can see via disklabel(8):
disklabel sd0# /dev/rsd0d: type: SCSI disk: DataTraveler 3.0 label: fictitious flags: removable bytes/sector: 512 sectors/track: 32 tracks/cylinder: 64 sectors/cylinder: 2048 cylinders: 14755 total sectors: 30218842 rpm: 3600 interleave: 1 trackskew: 0 cylinderskew: 0 headswitch: 0 # microseconds track-to-track seek: 0 # microseconds drivedata: 0 5 partitions: # size offset fstype [fsize bsize cpg/sgs] d: 30218842 0 unused 0 0 # (Cyl. 0 - 14755*) e: 30218779 63 MSDOS # (Cyl. 0*- 14755*) disklabel: boot block size 0 disklabel: super block size 0
sd0e MSDOS partition is
We can finally create an MS-DOS filesystem via newfs_msdos(8):
newfs_msdos /dev/rsd0e/dev/rsd0e: 30189264 sectors in 1886829 FAT32 clusters (8192 bytes/cluster) MBR type: 11 bps=512 spc=16 res=32 nft=2 mid=0xf0 spt=32 hds=64 hid=0 bsec=30218779 bspf=14741 rdcl=2 infs=1 bkbs=2
It is ready to be used and mounted via mount_msdos(8).
PC-style floppy disks work mostly like other disk devices like hard disks, except that you need to low-level format them first. To use an common 1440 KB floppy in the first floppy drive, first (as root) format it:
#fdformat -f /dev/rfd0a
Then create a single partition on the disk using disklabel(8):
#disklabel -rw /dev/rfd0a floppy3
Creating a small filesystem optimized for space:
#newfs -m 0 -o space -i 16384 -c 80 /dev/rfd0a
Now the floppy disk can be mounted like any other disk. Or if you already have a floppy disk with an MS-DOS filesystem on it that you just want to access from NetBSD, you can just do something like this:
#mount -t msdos /dev/fd0a /mnt
However, rather than using floppies like normal (bigger) disks, it is often more convenient to bypass the filesystem altogether and just splat an archive of files directly to the raw device. E.g.:
#tar cvfz /dev/rfd0a file1 file2 ...
A variation of this can also be done with MS-DOS floppies using
sysutils/mtools package which
has the benefit of not going through the kernel buffer cache
and thus not being exposed to the danger of the floppy being
removed while a filesystem is mounted on it.
See if your system has a ZIP drive:
dmesg | grep -i zipsd0 at atapibus0 drive 1: <IOMEGA ZIP 100 ATAPI, , 14.A> type 0 direct removable
Seems it has one, and it's recognized as sd0, just like any SCSI disk. The fact that the ZIP here is an ATAPI one doesn't matter - a SCSI ZIP will show up here, too. The ZIP is marked as "removable", which means you can eject it with:
Insert ZIP disk
Check out what partitions are on the ZIP:
#/dev/rsd0d: type: ATAPI ... 8 partitions:
#size offset fstype [fsize bsize cpg] d: 196608 0 unused 0 0 # (Cyl. 0 - 95) h: 196576 32 MSDOS # (Cyl. 0*- 95) disklabel: boot block size 0 disklabel: super block size 0
is the whole disk, as usual on i386.
is what you want, and you can see it's a msdos filesystem even.
Hence, use /dev/sd0h to access the zip's partition.
mount -t msdos /dev/sd0h /mnt
Access your files:
ls -la /mnttotal 40809 drwxr-xr-x 1 root wheel 16384 Dec 31 1979 . drwxr-xr-x 28 root wheel 1024 Aug 2 22:06 .. -rwxr-xr-x 1 root wheel 1474560 Feb 23 1999 boot1.fs -rwxr-xr-x 1 root wheel 1474560 Feb 23 1999 boot2.fs -rwxr-xr-x 1 root wheel 548864 Feb 23 1999 boot3.fs -rwxr-xr-x 1 root wheel 38271173 Feb 23 1999 netbsd19990223.tar.gz
Unmount the ZIP:
Eject the ZIP:
Data CDs can contain anything from programs, sound files (MP3, wav), movies (MP3, QuickTime) to source code, text files, etc. Before accessing these files, a CD must be mounted on a directory, much like hard disks are. Just as hard disks can use different filesystems (ffs, lfs, ext2fs, ...), CDs have their own filesystem, "cd9660". The NetBSD cd9660 filesystem can handle filesystems without and with Rockridge and Joliet extensions.
CD devices are named /dev/cd0a for both SCSI and IDE (ATAPI).
With this information, we can start:
See if your system has some CD drive:
dmesg | grep ^cdcd0 at atapibus0 drive 0: <CD-R/RW RW8040A, , 1.12> type 5 cdrom removable cd0: 32-bit data port cd0: drive supports PIO mode 4, DMA mode 0 cd0(pciide0:1:0): using PIO mode 0, DMA mode 0 (using DMA data transfers)
We have one drive here, "cd0". It is an IDE/ATAPI drive, as it is found on atapibus0. Of course the drive (rather, its medium) is removable, i.e., you can eject it. See below.
Insert a CD
Mount the CD manually:
mount -t cd9660 /dev/cd0a /mnt
This command shouldn't print anything. It instructs the system to mount the CD found on /dev/cd0a on /mnt, using the "cd9660" filesystem. The mountpoint "/mnt" must be an existing directory.
Check the contents of the CD:
ls /mntINSTALL.html INSTALL.ps TRANS.TBL boot.catalog INSTALL.more INSTALL.txt binary installation
Everything looks fine! This is a NetBSD CD, of course. :)
Unmount the CD:
If the CD is still accessed (e.g. some other shell's still "cd"'d into it), this will not work. If you shut down the system, the CD will be unmounted automatically for you, there's nothing to worry about there.
Making an entry in /etc/fstab:
If you don't want to type the full "mount" command each time, you can put most of the values into a line in /etc/fstab:
# Device mountpoint filesystem mount options /dev/cd0a /cdrom cd9660 ro,noauto
Make sure that the mountpoint,
/cdrom in our
Now you can mount the cd with the following command:
Access and unmount as before.
The CD is not mounted at boot time due to the "noauto" mount option - this is useful as you'll probably not have a CD in the drive all the time. See mount(8) and mount_cd9660(8) for some other useful options.
Eject the CD:
If the CD is still mounted, it will be unmounted if possible, before being ejected.
Use mscdlabel(8) to add all sessions to the CDs
then use the appropriate device node to mount the session you want.
You might have to create the corresponding device nodes in
mscdlabel cd1track (ctl=4) at sector 142312 adding as 'a' track (ctl=4) at sector 0 adding as 'b'
ls -l /dev/cd1bls: /dev/cd1b: No such file or directory
ls -l cd1*brw-r----- 1 root operator 6, 8 Mar 18 21:55 cd1a brw-r----- 1 root operator 6, 11 Mar 18 21:55 cd1d
mknod cd1b b 6 9
Make sure you fix the permissions of any new device
nodes you create:
ls -l cd1*brw-r----- 1 root operator 6, 8 Mar 18 21:55 cd1a brw-r--r-- 1 root wheel 6, 9 Mar 18 22:23 cd1b brw-r----- 1 root operator 6, 11 Mar 18 21:55 cd1d
chgrp operator cd1b
chmod 640 cd1b
ls -l cd1*brw-r----- 1 root operator 6, 8 Mar 18 21:55 cd1a brw-r----- 1 root operator 6, 9 Mar 18 22:24 cd1b brw-r----- 1 root operator 6, 11 Mar 18 21:55 cd1d
Now you should be able to mount it.
mount /dev/cd1b /mnt
By default, NetBSD only allows "root" to mount a filesystem. If you want any user to be able to do this, perform the following steps:
Give groups and other the access rights to the device.
#chmod go+rw /dev/cd0a
Ask NetBSD to let users mounting filesystems.
#sysctl -w vfs.generic.usermount=1
Note that this works for any filesystem and device, not only for CDs with a ISO 9660 filesystem.
To perform the mount operation after these commands, the user must own the mount point. So, for example:
$mount -t cd9660 -o nodev,nosuid /dev/cd0a `pwd`/cdrom
The mount options
nosuid are mandatory from NetBSD 4.0 on. They are
not necessary on NetBSD 3.x systems.
Sometimes, it is interesting to mount an ISO9660 image file before you burn the CD; this way, you can examine its contents or even copy files to the outside. If you are a Linux user, you should know that this is done with the special loop filesystem. NetBSD does it another way, using the vnode pseudo-disk.
We will illustrate how to do this with an example. Suppose you have an ISO image in your home directory, called "mycd.iso":
Start by setting up a new vnode, "pointing" to the ISO file:
vnconfig -c vnd0 ~/mycd.iso
Now, mount the vnode:
mount -t cd9660 /dev/vnd0a /mnt
Yeah, image contents appear under
Go to that
directory and explore the image.
When you are happy, you have to umount the image:
And at last, deconfigure the vnode:
vnconfig -u vnd0
Note that these steps can also be used for any kind of file that contains a filesystem, not just ISO images.
To play MPEG Video streams as many DVD players can play them
under NetBSD, mount the CD as you would do with any normal (data)
CD (see Section 13.4, “Reading data CDs with NetBSD”), then use the
package to play the mpeg files stored on the CD.
There are two ways to handle audio CDs:
Tell the CD drive to play to the headphone or to a
soundcard, to which CDROMs are usually connected
internally. Use programs like cdplay(1),
multimedia/kdemultimedia3 package, mixer
programs like mixerctl(1),
the Curses based
or kmix, which is part of
This usually works well on both SCSI and IDE (ATAPI) CDROMs, CDRW and DVD drives.
To read ("rip") audio tracks in binary form without going through digital->analog conversion and back. There are several programs available to do this:
For most ATAPI, SCSI and several proprietary
CDROM drives, the
audio/cdparanoia package can be
used. With cdparanoia the data can be saved to a file or
directed to standard output in WAV, AIFF, AIFF-C or raw
format. Currently the -g option is required by the NetBSD
version of cdparanoia. A hypothetical example of how to save
track 2 as a WAV file is as follows:
cdparanoia -g /dev/rcd0d 2 track-02.wav
If you want to grab all files from a CD, cdparanoia's batch mode is useful:
cdparanoia -g /dev/rcd0d -B
For ATAPI or SCSI CD-ROMs the
audio/cdd package can be
used. To extract track 2 with cdd, type:
cdd -t 2 `pwd`
This will put a file called
in the current directory.
For SCSI CD-ROMS the
audio/tosha package can be used.
To extract track 2 with tosha, you should be able to type:
tosha -d-t 2 -o track-02.cda
The data can then be post-processed e.g. by encoding it into MP3 streams (see Section 13.10, “Creating an MP3 (MPEG layer 3) file from an audio CD”) or by writing them to CD-Rs (see Section 13.12, “Using a CD-R writer to create audio CDs”).
The basic steps in creating an MPEG layer 3 (MP3) file from an audio CD (using software from the NetBSD packages collection) are:
Extract (rip) the audio data of the CD as shown in Section 13.9, “Using audio CDs with NetBSD”.
Convert the CD audio format file to WAV format. You only need to perform this job if your ripping program (e.g. tosha, cdd) didn't already do the job for you!
$sox -s -w -c 2 -r 44100 -t cdr track-02.cda track-02.wav
This will convert
in raw CD format to
track-02.wav in WAV format,
using signed 16-bit
words with 2
channels at a sampling
Encode the WAV file into MP3 format.
$bladeenc -128 -QUIT track-02.wav
This will encode
MP3 format, using a bit rate if
for bladeenc describes bit-rates in more detail.
$lame -p -o -v -V 5 -h track-02.wav track-02.mp3
You may wish to use a lower quality, depending on your taste and hardware.
The process of writing a CD consists of two steps: First, a "image" of the data must be generated, which can then be written to CD-R in a second step.
Reading an pre-existing ISO image
dd if=/dev/rcd0a of=filename.iso bs=2k
Alternatively, you can create a new ISO image yourself:
Generating the ISO image
Put all the data you want to put on CD into one directory. Next you need to generate a disk-like ISO image of your data. The image stores the data in the same form as they're later put on CD, using the ISO 9660 format. The basic ISO9660 format only understands 8+3 filenames (max. eight letters for filename, plus three more for an extension). As this is not practical for Unix filenames, a so-called "Rockridge Extension" needs to be employed to get longer filenames. (A different set of such extension exists in the Microsoft world, to get their long filenames right; that's what's known as Joliet filesystem).
The ISO image is created using the mkisofs command,
which is part
Example: if you have your data in /usr/tmp/data, you can generate a ISO image file in /usr/tmp/data.iso with the following command:
$mkisofs -o data.iso -r data Using NETBS000.GZ;1 for data/binary/kernel/netbsd.INSTALL.gz (netbsd.INSTALL_TINY.gz) Using NETBS001.GZ;1 for data/binary/kernel/netbsd.GENERIC.gz (netbsd.GENERIC_TINY.gz) 5.92% done, estimate finish Wed Sep 13 21:28:11 2000 11.83% done, estimate finish Wed Sep 13 21:28:03 2000 17.74% done, estimate finish Wed Sep 13 21:28:00 2000 23.64% done, estimate finish Wed Sep 13 21:28:03 2000 ... 88.64% done, estimate finish Wed Sep 13 21:27:55 2000 94.53% done, estimate finish Wed Sep 13 21:27:55 2000 Total translation table size: 0 Total rockridge attributes bytes: 5395 Total directory bytes: 16384 Path table size(bytes): 110 Max brk space used 153c4 84625 extents written (165 Mb)
Please see the mkisofs(8) man page for other options like noting publisher and preparer. The Bootable CD ROM How-To explains how to generate a bootable CD.
Writing the ISO image to CD-R
When you have the ISO image file,
you just need to write it on a
CD. This is done with the "cdrecord" command from the
Insert a blank CD-R, and off we go:
cdrecord -v dev=/dev/rcd0d data.iso...
After starting the command, 'cdrecord' shows you a lot of information about your drive, the disk and the image you're about to write. It then does a 10 seconds countdown, which is your last chance to stop things - type ^C if you want to abort. If you don't abort, the process will write the whole image to the CD and return with a shell prompt.
Note that cdrecord(8) works on both SCSI and IDE (ATAPI) drives.
Mount the just-written CD and test it as you would do with any "normal" CD, see Section 13.4, “Reading data CDs with NetBSD”.
If you want to make a backup copy of one of your audio CDs, you can do so by extracting ("ripping") the audio tracks from the CD, and then writing them back to a blank CD. Of course this also works fine if you only extract single tracks from various CDs, creating your very own mix CD!
The steps involved are:
If you have converted all your audio CDs to MP3 and now want to make a mixed CD for your (e.g.) your car, you can do so by first converting the .mp3 files back to .wav format, then write them as a normal audio CD.
The steps involved here are:
Create .wav files from your .mp3 files:
mpg123 -w foo.wav foo.mp3
Do this for all of the MP3 files that you want to have on your audio CD. The .wav filenames you use don't matter.
Write the .wav files to CD as described under Section 13.12, “Using a CD-R writer to create audio CDs”.
To copy an audio CD while not introducing any pauses as mandated by the CDDA standard, you can use cdrdao for that:
cdrdao read-cd --device /dev/rcd0d data.toc
cdrdao write --device /dev/rcd1d data.toc
If you have both a CD-R and a CD-ROM drive in your machine, you can copy a data CD with the following command:
cdrecord dev=/dev/rcd1d /dev/rcd0d
Here the CD-ROM (cd0) contains the CD you want to copy, and the CD-R
(cd1) contains the blank disk. Note that this only works with computer
disks that contain some sort of data, it does
not work with
audio CDs! In practice you'll also want to add something like
speed=8" to make things a bit
You can treat a CD-RW drive like a CD-R drive (see Section 13.11, “Using a CD-R writer with data CDs”) in NetBSD, creating images with mkisofs(8) and writing them on a CD-RW medium with cdrecord(8).
If you want to blank a CD-RW, you can do this with cdrecord's
cdrecord dev=/dev/rcd0d blank=fast
There are several other ways to blank the CD-RW,
call cdrecord(8) with
blank=help" for a list. See the cdrecord(8)
man page for more information.
Currently, NetBSD supports DVD media through the ISO 9660
also used for CD-ROMs. The new UDF filesystem also present on DVDs
has been supported since NetBSD 4.0. Information about mounting ISO 9660
and UDF filesystems can be found in the mount_cd9660(8) and
mount_udf(8) manual pages respectively.
DVDs, DivX and many avi files be played with
For some hints on creating DVDs, see this postings about growisofs and this article about recording CDs and DVDs with NetBSD.
To create an ISO image and save the checksum do this:
readcd dev=/dev/cd0d f=/tmp/cd.iso
Here is an alternative using dd(1):
dd if=/dev/cd0d of=/tmp/cd.iso bs=2048
If the CD has errors you can recover the rest with this:
dd if=/dev/cd0d of=/tmp/cd.iso bs=2048 conv=noerror
To create an ISO image from a mounted data CD first, mount the CD disk by:
mount -t cd9660 -r /dev/cd0d /mnt/cdrom
Second, get the image:
mkhybrid -v -l -J -R -o /tmp/my_cd.iso /mnt/cdrom/
You can read the volume data from an unmounted CD with this command:
file -s /dev/cd0d
You can read the volume data from an ISO image with this command:
isoinfo -d -i /tmp/my_cd.iso
You can get the unique disk number from an unmounted CD with this:
You can read the table of contents of an unmounted CD with this command:
cdrecord -v dev=/dev/cd0d -toc