Linux Lover wrote:
From /etc/fstab it is transperant that a CD Writer is a device, which
is mounted at a certain mount point, which can access iso9660 file
system blah blah blah blah.....
There is also an option for the writer which is `ro'. If the device
enjoyes the read only status, how do we able to write on discs?
A typical entry for the device is as follows :
/dev/cdrom /mnt/cdrom iso9660 noauto,owner,ro 0 0
From the above it is clear that the device do not have a write
permission. Still it writes, how?
Regards
Anindya Banerjee
The filesystem on a random access medium has to be mounted only if
access to it is desired through the usual commands: ls, cp, mv, read(),
write() etc.
With magnetic media the usual practice is to create a filesystem by the
process called formatting and then write/read files using commands like
those above.
Due to its nature, a CD-R must be written to all at once, which means we
cannot do this 2-step process with CD-Rs (although this is changing with
CD-RWs). Instead, the iso9660 filesystem is created as a file on a
different medium (a hard disk, usually) and then this file is written to
the CD in _raw_ mode. The CD does not have to be mounted for raw mode
access. (Indeed, it should not be mounted immediately before being
written on.)
Does this answer your question?
- Manas Laha
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