Power Computing PowerCenter PRO User Manual page 206

General recommendations:
• Use this option only when you want to mount and use PC-formatted data
that is on a disc employing both Macintosh and PC formats.
Note that application programs on PC-based volumes are not written to
run on the Macintosh. You will need PC emulator software or a DOS card
in order to run PC-based programs.
Read Ahead
Select the Read Ahead icon to enable CD-ROM ToolKit to anticipate the data
you want next, grab it, and store it into RAM. Read Ahead reads information
physically adjacent to the previous request. It functions in both forward and
reverse directions. This speeds system response to requests for information
by eliminating the time it takes to locate data.
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Figure 5. Read Ahead options
CD-ROM ToolKit Reference Guide