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Answers
- Replication
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What
is the difference between replication and duplication?
Replication is the common term for commercial pressed CD where the CD
is manufactured through injection-moulding from a master stamper made
from your data. Duplication is the common term for copying a master disk
to a CD-Recordable(CD-R) media.
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What
are the differences between CD-R and commercial pressed CD?
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CD-R
uses silver or gold as a reflective layer, while commercial pressed
CDs use aluminium.
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CD-R
media have a layer of optically active dye that reacts with the
recording laser to form information pits.
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Commercial
pressed CD are produced from a master stamper. Your source master
disk is used to create a glass master, which is in turn used to
create stamper molds. Plastic is injected into the molds, and an
exact copy of your master disk is 'pressed' just like a cookie cutter,
hence, the term "pressed CD".
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A
CD-R disk is generally more expensive than a commercial CD disk.
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When
should I use CD-Rs?
The fact that CD-R can be duplicated as and when required is a major benefit
to many users. It will be ideal in the following cases :
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- Fast turnaround
time
- Frequent
changes in the master
- Only a
small quantity is required.
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6.4 |
When
should I use commercial pressed CD?
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- Large
quantity is required i.e. 500 and above as cost per disk is less expensive
at higher volumes. Note that minimum required quantity for pressed CD
is 500.
- When you
are not in a great hurry as turnaround time range from 1 to 2 weeks.
- Higher
quality printing requirement.
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6.5 |
Why
does the cost per pressed CD decrease dramatically with larger quantities?
The majority of costs are related to setup, film, master, proof and other
related charges. Press setup involve color matching, preparing screens,
and several test CDs before production is started. Film is required for
each color in your artwork. Generating a metal master for CD pressing is
a time consuming and expensive process. Once the preliminary work is completed,
every copy after the first one takes a fixed amount of time, effort and
cost.
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6.6 |
What
is the turnaround time of replicating or duplicating CD?
Depends on the following requirements: |
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- How many
copies do you need?
- How quickly
do you need them?
- How much
data is on your disk?
- How intricate
is your label design?
- What kind
of packaging do you need?
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Typically,
the turnaround time for pressed CD replication is 7 to 12 days. For CD-R
duplication, the typical turnaround time is 24 to 48 hours.
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What
is the playback-compatibility of pressed CD and CD-R on CD-ROM and standalone
players?
Generally,
pressed CD has better compatibility as compared to CD-R.
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How
long do CD-R and pressed CD last?
Whether
CD-R or pressed CD last longer is difficult to answer. For CD-R, some
manufacturers claim lifespans of 75 years to 200 years once the disk has
been written. The shelf life of an unrecorded disk has been estimated
at between 5 to 10 years. There is no standard agreed-upon way to test
disks for lifetime viability. However, exposing the disk to excessive
heat, humidity, or to direct sunlight will greatly reduce the lifetime.
In general, CD-Rs are far less tolerant of environmental conditions than
pressed CDs, and should be treated with greater care. The easiest way
to make a CD-R unusable is to scratch the top surface. By some estimates,
pressed CDs may only last for 10 to 25 years, because the aluminium reflective
layer tends to corrode after a while.
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