2. August 2008 WD VelociRaptor 10K RPM 2.5” and 3.5” Enterprise SATA

3. WD Confidential VelociRaptor TM Only 10K SATA drive available! Highest areal density shipping (290Gb/in 2 ) 35% faster performance than Raptor TM 35% less power consumed than Raptor TM Capacities: 300 GB, 150G, 74G (BTO) Designed for Enterprise  Reliability  Performance  Compatibility  Low Power and Thermals 12/8/2015 2

4. WD Confidential 2 Form Factors BLFS Model 2.5” 15mm Form Factor Backplane Compatible HLFS Model Std 3.5” Form Factor Backplane Compatible 12/8/2015 3 Western Digital Confidential

5. WD Confidential 2.5” Enterprise Applications BLFS Model Enterprise Servers with 2.5” SAS/SATA slots 12/8/2015 4 Modular Servers Rackmount Servers 1U 2U Blade Servers $/GB savings vs. 10K RPM 2.5” SAS

6. WD Confidential 3.5” Enterprise Applications HLFS Model Std 3.5” Form Factor Backplane Compatible Enterprise servers and storage arrays 12/8/2015 5 Rackmount Servers 1U 2U Blade Servers Storage Arrays Superior performance and power consumption vs. 7200 RPM SATA

7. WD Confidential Product Specs 12/8/2015 6 WD VelociRaptor Features Models & Capacity300 GB, 150G, 74G Buffer Size16 MB InterfaceSATA 3 Gb/s Reliability MTTF1.4M hrs Warranty5 years Performance Seek Time (Read)4.2 ms Seek Time (Write)4.7 ms Read IOPS (QD=1)134 Sustained Data Rate126 MB/s Time to Ready10 sec max Average Latency3 ms Power Consumption Read/Write5.9W Idle4.7W Random Seek6.2W

8. WD Confidential Bare Drive Comparison VelociRaptor BLFS runs ~5C cooler than 10K 2.5” SAS competitor! VelociRaptor HLFS runs ~5C cooler than 10K 3.5” SATA! 12/8/2015 7 WD VelociRaptor BLFS Model Competitor S 10K RPM SAS Test: Ambient temperature running 100% random writes

9. WD Confidential VelociRaptor vs SAS Sequential Read 8 Enterprise server running IOMeter with write cache off

10. WD Confidential VelociRaptor vs SAS Random Read 9 Enterprise server running IOMeter with write cache off

11. WD Confidential VelociRaptor vs SAS Sequential Write 10 Enterprise server running IOMeter with write cache off

12. WD Confidential VelociRaptor vs SAS Random Write 11 Enterprise server running IOMeter with write cache off

13. WD Confidential Model Number Summary BLFS (July)  Targeted at Enterprise applications (full Enterprise validation)  Ships as bare 15mm 2.5” drive  Will not fit nor function in a notebook computer (requires 12V power) HLFS (August)  Targeted at Enterprise applications (full Enterprise validation)  Ships in a 3.5” mounting frame designed for Enterprise backplanes GLFS (EOL in September, customers transition to HLFS)  Targeted at WS/DT performance applications (Wintel validation)  Ships in a 3.5” mounting frame designed for cabled systems 12/8/2015 12

14. WD Confidential WD Roadmap (10K RPM) CQ2’08 CQ3’08 CQ4’08CQ1’09 Raptor 36G 74G 150G CQ2’09 300G WD3000GLFS 150G 300G WD1500BLFS WD3000BLFS August WD740BLFS (BTO) 74G 150G 300G 74G WD1500HLFS WD3000HLFS WD740HLFS (BTO) Transition to HLFS 10K RPM SATA Roadmap 13 CQ2’08 CQ3’08CQ4’08 CQ1’09 CQ2’09