1. 中文記者偏好聳動標題
2. Five-year-mark,五年左右換一棵新硬碟存重要資料,年齡超過五年的硬碟不要放貴重資料
3. Google 五年內用了至少十萬顆硬碟 (80GB to 400GB , P-ATA and S-ATA, 5400 and 7200 轉) ,取樣夠大
4. 使用量大容易壞只發生於 新硬碟 (一年內) 以及老硬碟 (五年以上)
5. SMART (Self-Monitoring, Analysis, and Reporting Technology) parameters alone are unlikely to be useful for predicting individual drive failures. 因為 false-negtive 多,sensitivity (敏感度) 只有 50 - 70 %
6. 未回答部分:google 的硬碟都是 " powered on, spinning, and generally in service for essentially all of their recorded life." 一般使用者硬碟並非無時無刻 power on ,備份資料用外接硬碟更是偶爾才上線,影響如何未知. Power cycle and power-on hours 的影響同樣未知
7. Failure rates are known to be highly correlated with drive models, manufacturers and vintages: 廠牌,型號和出場日期很重要,不過 google 不提供此方面資訊 ,僅強調其結果。至少製造日期是購買硬碟時可以注意的部分,地雷型號或廠牌就自己上各大討論區查囉. Most age-related results are impacted by drive vintages.