# Channel Numbering

When a system is powered up a channel number (also named drive index) will be assigned to each FlexDrive. The drive index is dependent of which FlexCarrier and where in the FlexCarrier the FlexDrive is mounted.

Example: Channel numbering

Carrier 1 | Slot 1 | Slot 2 | Slot 3 | Slot 4 | Slot 5 | Slot 6
Controller | Drive | Drive | Drive | Drive | Drive
Drive index | - | 2 | 3 | 4 | 5 | 6

Carrier 2 | Slot 1 | Slot 2 | Slot 3 |  |  |
Drive | Drive | Drive |  |  |
Drive index | 7 | 8 | 9 |  |  |