Avago Technologies MegaRAID SATA 150-4 (523) - Manual (Page 15)

Creating a RAID 50 Volume with 2 SATA RAID Adapters 2-7
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The Assign a Drive Letter or Path window opens.
Figure 2.8 Assign a Drive Letter or Path
7. Select the Assign a Drive Letter radio button. From the drop-down
list select the desired drive letter. Click Next and the Format Volume
window opens.