Dell OptiPlex 755 User Manual page 302

6 From the drop-down box, select RAID 1 as the RAID level.
NOTE:
Select the hard drive that you want to use as your source hard drive (it should be the hard drive containing
the data or operating system files that you want to keep on the RAID volume).
7 On the Select Source Hard Drive screen, double-click the hard drive from which you want to migrate,
and click Next.
8 On the Select Member Hard Drive screen, double-click the hard drive to select the member drive that
you want to act as the mirror in the configuration, and click Next.
9 On the Specify Volume Size screen, select the volume size you want, and click Next.
NOTE:
In step 10, all data contained on the member drive is removed.
10 Click Finish to start migrating, or click Back to make changes. You can use your computer normally
during migration process.
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Advanced Features