This error indicates that you have attempted to attach more than one SAN device using the same drive number.

If you are attempting to use the ''[[:cmd:sanboot]]'' or ''[[:cmd:sanhook]]'' commands to attach multiple different SAN drives, then you will need to specify explicit drive numbers.  For example:

    sanhook --drive 0x80 iscsi:192.168.0.1::::iqn.2010-04.org.ipxe.chipmunk:boot
    sanhook --drive 0x81 iscsi:192.168.0.1::::iqn.2010-04.org.ipxe.chipmunk:data
    sanboot --drive 0x80

If you are attempting to use the ''[[:cmd:sanboot]]'' or ''[[:cmd:sanhook]]'' commands to attach a multipath SAN drive, then you will need to specify the full list of SAN URIs in a single command.  For example:

    sanboot iscsi:192.168.0.1::::iqn.2010-04.org.ipxe.chipmunk:boot \
            iscsi:192.168.0.2::::iqn.2010-04.org.ipxe.chipmunk:boot

If you are attempting to replace an existing SAN drive then you must first use the ''[[:cmd:sanunhook]]'' command to disconnect the existing SAN drive.