Intel SS4000-E - Entry Storage System NAS Server User Manual page 190

PXE Remote Boot
If you unplug the original physical disk before a PXE boot, the PXE disk will be the
system and boot partition. When the original physical disk is still fully connected, the
system disk is on the original local disk because Microsoft Windows* remembers its disk
signatures as illustrated in the following example.
Note: The simplest way to identify the PXE disk is to remember its drive letter. For example; If
your original system drive was C:, the disk identified as C: during the PXE boot is the
PXE boot disk.
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Intel Entry Storage System SS4000-E User Guide