4

First Steps
Requirements:
 You have enough privileges to do so.
To set up 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 than 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.
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 Nero Linux to the newly created group
2.2.3.2 Udev Support
Nero Linux supports udev, the new /dev file system implementation that is used in actual Li-
nux distributions.
With this file system, all permissions are set during boot time using some specific configura-
tion files. In order to make your modifications permanent, you have to change the files lo-
cated in /etc/udev/rules.d. For more details, you can have a look at the udev FAQ.
In some rare cases a hotplug device that gets plugged in when Nero Linux is already started
might not be recognized directly. In such cases, simply restart Nero Linux.
2.2.4 Setting up DMA Acceleration on IDE Devices
DMA acceleration provides an improvement in throughput for the disc drives and lets 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 at startup.
If your hardware supports it, we recommend enabling DMA acceleration not only for IDE
hard drives, but also for disc drives such as CD/DVD readers and recorders.
This takes place in the operating system and not in Nero Linux.
If one of your devices does not have DMA acceleration, Nero Linux will warn you when start-
ing the application.
Proceed as follows to activate the DMA acceleration on a device:
1. Type the following command as root: hdparm –d1 /dev/hdX
(where X stands for the letter that corresponds to the IDE device)
 DMA acceleration is activated.
Nero Linux 11