Some　of　the　keys　have　a　special　use.　There　are　referred　to　as　command　keys.　The　3　most　common　are　the　Control　or(66),　Alternate　or(67)and　the　Shift　keys　though　there　can　be　more(the　Windows　key　for　example　or　the　Command　key).　Each　key　on　a　standard　keyboard　has　one　or　two　characters.　Press　the　key　to　get　the　lower　character　and　hold　Shift　to　get　the　upper.　Disk　Drives　-　All(68)need　a　drive　to　get　information　off　-　or(69)-　and　put　information　　on　the　disk　-　or(70).　Each　drive　is　designed　for　a　specific　type　of　disk　whether　it　is　a　CD,　DVD,　hard　disk　or　floppy.　Often　the　term　'disk'and　'drive'are　used　to　describe　the　same　thing　but　it　helps　to　understand　that　the　disk　is　the　storage　device　which　contains　computer　files-or　software　-　and　the　drive　is　the　mechanism　that　runs　the　disk.