Abit IT5 Series User Manual page 72

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Computer
knowledge
2
For further information about HDD installation, refer to Appendix E.
MODE 0~4 reflects the HDD data transfer rate. The higher
the MODE value is, the better is the HDD data transfer rate.
But it does not mean that you can select the highest MODE
value just as you like, you first have to be sure that your
HDD supports this MODE, otherwise the hard disk will not
be able to operate normally.
Chapter 3