一般來說7200轉3.5吋SATA2硬碟都在5.5分以上，但我看到大部分用Seagate的人都在抱怨評分沒超過3分，對照微軟的說法，很明顯Seagate的硬碟韌體設計幾乎都有問題。
微軟澄清︰Windows 7 的硬碟評分低不是Bug，是設計意圖
看到這裡老有人說Windows 7的硬碟只有2.0、3.0，然後就有人回復說這是Windows 7的Bug，只要把快取關閉就會好了。
事實上這不是Bug，微軟官方的Windows Blog曾專門說明︰這是設計意圖。
Blog上稱，由於有些硬碟的韌體設計不完善，總是傾向於先完成Cache中的數據讀寫，而非優先完成當先使用者的讀寫要求。造成系統響應較慢，偶爾會有停頓感。對於此類硬碟，Windows 7的評分機制會視情況，予以2.0、3.0等的分數封頂。
所以，關閉快取只能算是自我安慰的做法。有可能Windows 7進入正式版後，你的硬碟評分仍然偏低。
附微軟Engineering Windows 7 Blog原文︰
In analyzing these traces we saw a connection to disk I/O and we often found typical 4KB disk reads to take longer than expected, much, much longer in fact (10x to 30x). Instead of taking 10s of milliseconds to complete, we’d often find sequences where individual disk reads took many hundreds of milliseconds to finish. When sequences of these accumulate, higher level application responsiveness can suffer dramatically.
To reflect this real world learning, in the Windows 7 Beta code, we have capped scores for drives which appear to exhibit the problematic behavior (during the scoring) and are using our feedback system to send back information to us to further evaluate these results. Scores of 1.9, 2.0, 2.9 and 3.0 for the system disk are possible because of our current capping rules.
大意︰分析發現，某些硬碟讀寫時間延遲嚴重，達到正常範圍的10至30倍，影響了程式響應。針對這一現象，Windows 7進行了評分封頂。這類硬碟可能被評為1.9、2.0、2.9和3.0分。
