The slot numbering for the drives varies by server model; however, the numbering begins from 0 for the some servers and from 1 for other servers.
Hitachi Advanced Server DS120
Hitachi Advanced Server DS220 12LFF
Hitachi Advanced Server DS220 24SFF
Hitachi Advanced Server DS220 G2
Hitachi Advanced Server DS225
Hitachi Advanced Server DS240
Hitachi Advanced Server HA810 G2
Hitachi Advanced Server HA820 G2
Hitachi Advanced Server HA805 G3
Hitachi Advanced Server HA810 G3
Hitachi Advanced Server HA815 G3
Hitachi Advanced Server HA820 G3
Hitachi Advanced Server HA825 G3