3
Technical Information
To setup correct permissions on your device files, proceed as follows:
1. Open a terminal.
2. Type the following command (where X is the letter corresponding to the IDE device):
1. chmod o+r+w /dev/sg*
2. chmod o+r+w /dev/hdX
3. You can run the last command more that once if you have multiple IDE devices.
Users are given read and write permission on all your SCSI generic devices (CD-ROM
for example) and your IDE disc devices.
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If you only want to give access to some users, another possibility is to create a
new group called for example "nero" and change the group of the device files
corresponding to your disc devices with it. Then give read/write permission to
the group on these device files and finally, just add all the users that are al-
lowed to use to the newly created group
14.1.3.3.2 udev support
Nero Linux supports udev, the new /dev file system implementation that are used in actual
Linux distributions.
With this file system, all permissions is set during boot time using some specific configuration
files. In order to make your modifications permanent, you have to change the files located in
/etc/udev/rules.d. For more details, you can have a look to udev FAQ.
In some rare cases, an hotplug device that gets plugged in when Nero Linux is already star-
ted might not being recognized directly. In such cases, restart Nero Linux.
14.1.3.4 Setting up DMA acceleration on IDE devices
DMA acceleration provides an improvement in throughput for the disc drives, and let you sa-
fely use all your recording devices. Depending on your Linux kernel and distribution configu-
ration, you might have DMA acceleration that is automatically enabled on startup.
If your hardware supports it, we recommend enabling DMA acceleration not only for IDE
hard disk drives, but also for disc drives such as CD/DVD readers and recorders.
If one of your devices has no DMA acceleration, Nero Linux will warn you when starting the
application.
Proceed as follows to activate the DMA acceleration on a device (please note that this set-
ting is performed in the operating system, not in Nero Linux):
1. Carry out the following command as roo
ce)
t: hdparm –d1 /dev/hdX (where X stands for the let-
DMA acceleration is activated.
ter that corres
ponds to the IDE devi