Siemens SIMATIC PC 847B Operating Instructions Manual page 225

PXE server
A Preboot Execution Environment server is part of a network environment and can provide
software to connected computers even before they boot. This can involve operating system
installations or servicing tools, for example.
RAID
Redundant Array of Independent Disks: Data storage system which is used to save data and
the corresponding error correction codes (parity bits, for example) to at least two hard disk
volumes in order to enhance reliability and performance. The hard disk array is controlled by
management programs and a hard disk controller for error correction. The RAID system is
usually implemented in network servers.
Recovery CD
Contains the tools for configuring hard disks and the Windows operating system.
Reset
Hardware reset: Reset/restart of the PC using a button/switch.
Restart
Warm restart of a computer without switching the power off (Ctrl + Alt + Del)
Restore DVD
The Restore DVD is used to restore the system partition or the entire hard disk to factory
state if the system has crashed. The bootable DVD contains all the necessary image files.
You can also create a boot disk allowing restoration via the network.
ROM
Read-Only Memory ROM is a read-only memory in which every memory location can be
addressed individually. The programs or data are permanently stored and are not lost in the
event of a power failure.
SCSI interface
Small Computer System Interface Interface for connecting SCSI devices such as hard disk
drives or optical drives.
Session at once
In session at once, the CD can be written to both with an audio session and a data session.
The two sessions are written to at once (as in disc at once).
SIMATIC Rack PC 847B
Operating Instructions, 06/2008, A5E02203168-01
Glossary
225