Toshiba Satellite A40 User Manual page 76

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You cannot overwrite data that has been previously written to a
DVD RW disc.
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You cannot partially delete any data written to a DVD RW disc.
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Data written to a CD R/DVD R disc cannot be deleted either in whole
or in part.
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Data deleted (erased) from a CD RW and DVD RW/ RAM disc cannot
be recovered. Check the content of the disc carefully before you
delete it. If multiple drives that can write data to discs are connected,
be careful not to delete data from the wrong drive.
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In writing to a DVD R/ RW disc, some disc space is required for file
management, so you may not be able to write the full capacity of the
disc.
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Since the disc is based on the DVD standard, it will be filled with
dummy data if the written data is less than about 1 GB. Even if you
write only a small amount of data, it might take time to fill in the
dummy data.
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Two types of DVD R/ RW discs are on the market: data and video.
Use a video disc to store video data. You can use video discs on a
DVD recorder as well as on your computer's DVD ROM drive. You
cannot use data discs on a DVD recorder.
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When multiple drives that can write data to discs are connected, be
careful not to write to the wrong drive.
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Be sure to connect the universal AC adaptor before you write or
rewrite.
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Be sure to close all other software programs except the writing
software.
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Do not run software such as a screen saver, which can put a heavy
load on the CPU.
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Operate the computer in the full power mode. Do not use
power saving features.
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Do not write while virus check software is running. Wait for it to finish,
then disable virus detection programs including any software that
checks files automatically in the background.
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Do not use hard disk utilities, including those intended to enhance
HDD access speed. They may cause unstable operation and data
damage.
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Write from the computer's HDD to the CD/DVD. Do not try to write
from shared devices such as a LAN server or any other network
device.
TOSHIBA A40 Series
Operating Basics
4 11