, ▁hot ▁sw app able ▁components , ▁online ▁micro code ▁updates ▁and ▁mirror ed ▁cache ▁with ▁battery ▁backup . ▁The ▁active - active ▁controllers ▁include ▁automatic ▁fail over . ▁ ▁Advanced ▁security ▁capabilities ▁include ▁Hit achi ▁Data ▁Ret ention ▁Util ity ▁software ▁with ▁its ▁“ write ▁once , ▁read ▁many ” ▁( WOR M ) ▁feature ▁that ▁protect s ▁data ▁from ▁over writ es ▁or ▁er asures ▁for ▁long ▁periods ▁of ▁time . ▁System ▁management ▁access ▁limits ▁authorization ▁to ▁change ▁the ▁system . ▁System ▁aud it ▁logging ▁records ▁all ▁system ▁changes . ▁Communic ations ▁between ▁the ▁management ▁software ▁and ▁storage ▁are ▁encrypted . ▁ ▁The ▁A MS ▁ 2 0 0 0 ▁family ▁lets ▁you ▁choose ▁drives ▁to ▁meet ▁your ▁business ▁needs : ▁▁ ▁Flash ▁▁ 1 5 K ▁R PM ▁S AS ▁▁ 7 2 0 0 ▁R PM ▁S ATA ▁II ▁ ▁The ▁High ▁D ens ity ▁Storage ▁T ray ▁provides ▁ 4 8 ▁S ATA ▁or ▁ 3 8 ▁S AS ▁dis ks ▁in ▁a ▁ 4 U ▁( 1 7 6 mm ) ▁high ▁t ray . ▁Up ▁to ▁ 4 8 0 ▁dis ks ▁can ▁be ▁installed ▁in ▁a ▁single ▁ra ck ▁without ▁sacrific ing ▁performance ▁or ▁avail ability . ▁ ▁This ▁family ▁of ▁storage ▁systems ▁supports ▁ret ract ing ▁the ▁heads ▁on ▁S ATA ▁disk ▁drives ▁or ▁even ▁intellig ently ▁spin ning ▁down ▁drives ▁that ▁are ▁not ▁active ▁to ▁reduce ▁energy ▁consumption . ▁IN ▁addition , ▁the ▁system ▁fans ▁operate ▁at ▁variable ▁spe eds , ▁determined ▁by