The rationale for a dedicated boot device like this is straightforward: it keeps the OS/hypervisor volume off the main data drive bays entirely, freeing every front bay for actual data storage rather than sacrificing one to the operating system, and it isolates boot-volume failures or maintenance from the data array. 'Customer Kit' means this is sold as an aftermarket/spare-parts unit for adding or upgrading a boot device after the server's original purchase, rather than a factory-fitted configuration. At 960GB, it's sized well beyond what a bare OS install needs, leaving genuine headroom for a hypervisor, its logs, and local VM templates or ISOs stored directly on the boot volume itself. Buying it as a Single Stick configuration rather than the mirrored two-stick option is a deliberate cost/redundancy trade-off — appropriate where boot-drive failure is an acceptable, quickly-recoverable event rather than a mission-critical single point of failure.