Gene Heskett wrote:
On Friday 25 November 2005 16:27, Mattia Forza wrote:
i have the number of blocks...but when i run the shell u told me...it
says:
"dd: /dev/cdrom: No such file or directory
sha1sum: No such file or directory"
what does it means?
Use whatever device is the dvdwriter, /dev/cdrom is a link here to
/dev/hdc. It could be real or a link on your system. If there is a
file in /var/log, called dmesg, browse it to see what the writer was
called at boot time discovery and use that.
it's not that simple:-(
OSX has character and block devices for the same disk, for different
purposes.
And the name used can change from one time to another:
eagle:~ summer$ mount
/dev/disk0s10 on / (asynchronous, local)
devfs on /dev (local)
fdesc on /dev (union)
<volfs> on /.vol
automount -nsl [234] on /Network (automounted)
automount -fstab [239] on /automount/Servers (automounted)
automount -static [239] on /automount/static (automounted)
/dev/disk1s2 on /Volumes/Bonjour Browser (local, nodev, nosuid,
read-only, mounted by summer)
/dev/disk2s0 on /Volumes/M521 (local, nodev, nosuid, read-only)
eagle:~ summer$
I just popped a CD in and that got mounted at /Volumes/M521
I can't figure how to ject it with huditul, but I can read it:
eagle:~ summer$ dd if=/dev/disk2s0 count=1 | xxd | head
1+0 records in
1+0 records out
512 bytes transferred in 0.006801 secs (75284 bytes/sec)
0000000: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0000010: 0000 0000 0000 0000 0000 0000 0000 0000 ................
As to the second error, do you not have the utility sha1sum on that
machine? If missing, that seems to be a potentially serious security
shortcoming.
If you have md5sum, it can be substituted, but will give different
answers when compared to sha1sum. Whatever you use, the .iso file, and
the readback from the device should be identical.
it's called md5, its report format is different, but thankfully the
result's the same.
Also, make sure the pipe symbol used by the mac is the same as used in
the rest of the *nix world, a vertical bar found by shifting the
backslash key on common keyboards. Some systems have been known to use
the exclamation point as a substitute but that was microwares os9, on a
TRS-80 Color Computer from 2 decades back. I still have one, running
at times. :)
OS X is more Unix than Linux is:-)
--
Cheers
John
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