เจ๊งไม่เ้จ๊ง ข้อควรรู้เกี่ยวกับ Hard Drive

Google มัน index web ทั้ง internet ก็เป็นธรรมดาที่มันจะต้องใช้ hard drive มากมาย เร็ว ๆ นี้ google ได้รวมเอาข้อมูลเกี่ยวกับ hard drive failure rates ออกมาเผยแพร่ต่อสาธารณะชนในชื่อ "Failure Trends in a Large Disk Population"

จากข้อมูลสำรวจกว่า 100,000 drives, ได้ข้อสรุปดังต่อไปนี้

• Mean Time Between Failure rates mean nothing.
• SMART (Self-Monitoring, Analysis and Reporting Technology) diagnostics and hardware monitoring are not as useful as they are supposed to be. It missed 36% of all uh-ohs. Some SMART parameters (scan errors, reallocation counts, offline reallocation counts, and probational counts) have a large impact on failure probability. Others do not. There was a lack of failure-predicting SMART signals on a large proportion of failed drives. Out of all failed drives, over 56 percent of them had no count in any of these four strong SMART signals.
  
• Overworked drives fail similarly to standard drives after the first year.
• Hard drive age means less than you think.
• Failure does not go up when temperatures are higher than usual (unless super high.)

ด้าน CMU ก็ให้ข้อมูลออกมาว่า

• Customers are replacing disk drives more frequently than vendor estimates of mean time to failure (MTTF) would require.
  

Source: Gizmodo, PC World , Slashdot