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Glossary
Nero DiscSpeed 70
On-the-fly
The name on-the-fly describes a burn process for discs. In this process, data is written to the
disc directly from an image.
PI Errors
Parity of inner code is part of the structure of a DVD's data block, and is used for error cor-
rection purposes. If a PI in a DVD cannot be read, one speaks of a PI error.
PO Errors
The parity of outer code is part of the structure of the data block of a DVD and is used for er-
ror correction purposes. If a PO on a DVD cannot be read, one speaks of a PO error.
Read Speed
The read speed of a drive is a factor of the speed that the laser needs in order to read the
data on an optical storage medium, e.g. 8x or 16x speed.
Ripping
Ripping refers to the process of extracting audio or video data from an optical storage me-
dium onto a computer's hard drive in order to process it.
Rotational speed
Discs can be read and/or burned in different ways. As a general rule, the reading process in
optical drives starts at the radius of the disc and moves from the center outwards. The two
standards used to define the types of rotational speed are linear velocity and angular veloc-
ity. With constant angular velocity, the tracks at the center of the disc always travel at the
slowest linear velocity. The linear velocity increases as you move away from the center to-
wards the outer edge. Angular velocity (also called rotational speed) describes the change in
the rotation angle over time independently of the radius of the disc, i.e. the velocity at which
an object loops a sector.
RPM
Revolutions per minute (RPM) is an English unit that is used in mechanics to represent rota-
tional speed. It indicates the number of complete revolutions per minute.
Search Time
The seek time is the time the drive needs to move the read head to a specific position on the
disc that is inserted in the drive. In other words, the seek time encompasses the period of
time between the arrival of a write or read command and commencement of the actual write
or read process.
Sector
A sector is the smallest addressable information unit on a CD-ROM. A sector is composed of
2,352 bytes, of which - depending on the type of CD used - different amounts are available
as user data. A sector generally consists of a header, synchronization bits and user data. It
may also have error recognition and correction data.
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