IBM DDRS-39130 - Ultrastar 9.1 GB Hard Drive Specifications page 150

Only the Initiator that issued the Reserve command for a L U N may release the LUN, regardless of the
3rdPty option. This Initiator may also release the L U N by issuing another Reserve command. This super-
seding Reserve command releases the previous reservation when the new reservation is granted.
Reservation queuing is not supported by the Drive. If a L U N is reserved and a Reserve command is issued
from a different initiator, the Target responds with a reservation Conflict.
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O E M Spec. of DDRS-3xxxx