Dot Hill Systems (HILL) 8-K Other Events

Dot Hill Confidential Growth Rates: Server OEMs vs. Vertical Markets -50% -25% 0% 25% 50% 75% 100% 125% 150% 175% Q1'11 Q2'11 Q3'11 Q4'11 Q1'12 Q2'12 Q3'12 Server-OEM Vertical Markets -50% -25% 0% 25% 50% 75% Q1'11 Q2'11 Q3'11 Q4'11 Q1'12 Q2'12 Q3'12 Server-OEM Vertical Markets Year-Over-Year Quarterly Revenue Growth Rate Sequential Quarter-Over-Quarter Revenue Growth Rate 16 December 6, 2012 NASDAQ: HILL

Dot Hill Confidential Non-GAAP Revenue Reconciliation 2 Q1'10A Q2'10A Q3'10A Q4'10A Q1'11A Q2'11A Q3'11A Q4'11A Q1'12A Q2'12A Q3'12A Server $31,238 $38,944 $38,072 $43,270 $39,295 $42,767 $37,041 $36,407 $34,879 $36,164 $36,515 Vertical Markets $8,318 $5,841 $4,565 $7,408 $6,784 $8,359 $9,591 $10,449 $17,178 $10,034 $10,272 Services $1,941 $2,690 $2,105 $2,074 $2,464 $1,332 $1,173 $1,173 $2,539 $1,512 $1,436 Total Non-GAAP Revenue $41,496 $47,475 $44,741 $52,753 $48,543 $52,458 $47,805 $48,028 $54,596 $47,709 $48,223 UVS Revenue $93 $149 $39 $144 $631 $721 $266 $16 $147 $59 $26 HP Warrants -$1,007 NetApp $18,384 $17,870 $16,805 $12,544 Total GAAP Revenue $59,974 $65,493 $61,586 $65,440 $49,174 $53,179 $48,071 $47,037 $54,744 $47,768 $48,249 26December 6, 2012 NASDAQ: HILL