Sony PCG-X18 - Manual (Page 53)

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How to use your partitioned drives.
In order to avoid mishandling or malfunction of your software and files, please take
the following precautions:

Don't try to resize your partition, the parameters have been set at the factory for
an optimal operability of the hardware and software.

If you want to exploit the capacity of your D: drive, you can designate this
partition to store your documents. Use the C: to install new applications.

When you perform a system and application recovery of your computer, your D:
drive won't be changed.