Backblaze 丟出去年的報告了：「Backblaze Hard Drive Stats for 2019」。
WD/HGST 的還是最耐用，再來是 Toshiba 的，最後是 Seagate 的。
不過有一些硬碟沒有列到表上，像是「Seagate 16 TB Drives」這組因為 2019Q4 才剛裝上去，所以才 1440 drive days，因此還沒到門檻所以沒放進報告，但就 Backblaze 測試起來看起來是個好的開始：
In Q4 2019 we started qualifying Seagate 16 TB drives, model: ST16000NM001G. As of the end of Q4 we had 40 (forty) drives in operation, with a total of 1,440 drive days—well below our 5,000 drive day threshold for Q4, so they didn’t make the 2019 chart. There have been 0 (zero) failures through Q4, making the AFR 0%, a good start for any drive. Assuming they continue to pass our drive qualification process, they will be used in the 12 TB migration project and to add capacity as needed in 2020.
再來是把 2017/2018/2019 擺在一起看：
馬上可以看到的是 AFR 上升了不少，一個是因為 8TB 系列的硬碟進入中年期，另外是 Seagate 12TB 硬碟的問題：
The total AFR for 2019 rose significantly in 2019. About 75% of the different drive models experienced a rise in AFR from 2018 to 2019. There are two primary drivers behind this rise. First, the 8 TB drives as a group seem to be having a mid-life crisis as they get older, with each model exhibiting their highest failure rates recorded. While none of the rates is cause for worry, they contribute roughly one fourth (1/4) of the drive days to the total, so any rise in their failure rate will affect the total. The second factor is the Seagate 12 TB drives, this issue is being aggressively addressed by the 12 TB migration project reported on previously.
所以大原則還是跟以前差不多，沒有時間特別研究的話就先往 WD/HGST 這邊找...