我最近購買了一台 KSD-PA25.6-064MS，它已預先格式化，分割區從第 63 區開始。
我知道這對 SSD 來說並不常見，並且可能會導致過度的寫入放大。不過，既然廠商就是這麼做的，可能是專門為這個特定的佈局而設計的。
製造商網站上的規格不要告訴任何有關擦除區塊或類似內容的資訊。同樣，我還無法直接聯繫製造商 - 他們網站上指定的管道似乎不起作用。
有沒有人做過性能測試或其他東西來找出內部參數，特別是上述問題？
我不感興趣有關 SSD 結構的一般信息。我對 KingSpec 驅動器特別感興趣（越接近我的型號越好）——無論它們是否特殊。
答案1
我最終沒能得到任何製造商的答复，即使我抄送了他們的海外銷售經理（他們網站上唯一被證明有效的聯繫渠道），他將我的消息轉發給適當的部門，並要求他們做出回應。
根據確定 SSD 的內部扇區大小以實現可能的分區對齊 - PC Review 新聞組，KingSpec 硬碟使用庫存第 3 方快閃記憶體晶片（如對較低價格段產品的預期） - 因此出現任何異常內部結構的可能性非常小。
根據 flashbench輸出：
$ flashbench -a /dev/sda -b 1024
align 536870912 pre 547Вµs on 702Вµs post 528Вµs diff 164Вµs
align 268435456 pre 540Вµs on 700Вµs post 544Вµs diff 158Вµs
align 134217728 pre 565Вµs on 717Вµs post 531Вµs diff 168Вµs
align 67108864 pre 571Вµs on 727Вµs post 547Вµs diff 168Вµs
align 33554432 pre 554Вµs on 732Вµs post 554Вµs diff 178Вµs
align 16777216 pre 568Вµs on 664Вµs post 551Вµs diff 104Вµs
align 8388608 pre 575Вµs on 644Вµs post 590Вµs diff 61.2Вµs
align 4194304 pre 576Вµs on 644Вµs post 590Вµs diff 60.9Вµs
align 2097152 pre 576Вµs on 645Вµs post 591Вµs diff 61.5Вµs
align 1048576 pre 577Вµs on 646Вµs post 591Вµs diff 61.8Вµs
align 524288 pre 576Вµs on 646Вµs post 593Вµs diff 61.5Вµs
align 262144 pre 575Вµs on 646Вµs post 590Вµs diff 62.8Вµs
align 131072 pre 583Вµs on 649Вµs post 574Вµs diff 70.3Вµs
align 65536 pre 585Вµs on 653Вµs post 582Вµs diff 70Вµs
align 32768 pre 586Вµs on 652Вµs post 580Вµs diff 68.7Вµs
align 16384 pre 584Вµs on 624Вµs post 586Вµs diff 39.4Вµs
align 8192 pre 586Вµs on 605Вµs post 587Вµs diff 19Вµs
align 4096 pre 585Вµs on 605Вµs post 586Вµs diff 19.4Вµs
align 2048 pre 584Вµs on 584Вµs post 585Вµs diff 379ns
我的驅動器使用 16K 扇區和 16M 擦除區塊。
現在，讓我們看看分區的時間：
$ flashbench -a /dev/sda1 -b 1024
align 536870912 pre 690Вµs on 671Вµs post 722Вµs diff -35600n
align 268435456 pre 707Вµs on 683Вµs post 734Вµs diff -37774n
align 134217728 pre 691Вµs on 672Вµs post 724Вµs diff -36217n
align 67108864 pre 711Вµs on 688Вµs post 741Вµs diff -37954n
align 33554432 pre 717Вµs on 694Вµs post 746Вµs diff -37195n
align 16777216 pre 714Вµs on 692Вµs post 744Вµs diff -36476n
align 8388608 pre 759Вµs on 736Вµs post 786Вµs diff -36996n
align 4194304 pre 757Вµs on 732Вµs post 782Вµs diff -37075n
align 2097152 pre 758Вµs on 733Вµs post 783Вµs diff -38152n
align 1048576 pre 757Вµs on 735Вµs post 788Вµs diff -37275n
align 524288 pre 759Вµs on 736Вµs post 786Вµs diff -36078n
align 262144 pre 754Вµs on 733Вµs post 789Вµs diff -38073n
align 131072 pre 738Вµs on 718Вµs post 766Вµs diff -33265n
align 65536 pre 747Вµs on 728Вµs post 773Вµs diff -32086n
align 32768 pre 745Вµs on 725Вµs post 776Вµs diff -35799n
搞什麼？沒有圖案和消極的差異？事實上，這表示讀取未與 SSD 區塊對齊。
事實上，如果我將分割區起始位置變更為磁區 64，輸出將變更為更預期的結果：
$ flashbench -a /dev/sda1 -b 1024
align 536870912 pre 531Вµs on 600Вµs post 530Вµs diff 69.3Вµs
align 268435456 pre 543Вµs on 611Вµs post 542Вµs diff 68.4Вµs
align 134217728 pre 531Вµs on 600Вµs post 531Вµs diff 68.9Вµs
align 67108864 pre 548Вµs on 618Вµs post 548Вµs diff 69.8Вµs
align 33554432 pre 555Вµs on 624Вµs post 553Вµs diff 70.4Вµs
align 16777216 pre 552Вµs on 622Вµs post 552Вµs diff 69.9Вµs
align 8388608 pre 594Вµs on 664Вµs post 592Вµs diff 71.1Вµs
align 4194304 pre 593Вµs on 660Вµs post 590Вµs diff 68.7Вµs
align 2097152 pre 590Вµs on 660Вµs post 593Вµs diff 69.1Вµs
align 1048576 pre 593Вµs on 665Вµs post 595Вµs diff 71.6Вµs
align 524288 pre 594Вµs on 663Вµs post 591Вµs diff 70.1Вµs
align 262144 pre 593Вµs on 664Вµs post 594Вµs diff 70.5Вµs
align 131072 pre 578Вµs on 643Вµs post 577Вµs diff 65.4Вµs
align 65536 pre 583Вµs on 650Вµs post 577Вµs diff 70Вµs
align 32768 pre 583Вµs on 654Вµs post 587Вµs diff 68.8Вµs
align 16384 pre 581Вµs on 623Вµs post 584Вµs diff 40.4Вµs
align 8192 pre 583Вµs on 601Вµs post 582Вµs diff 17.9Вµs
align 4096 pre 582Вµs on 601Вµs post 583Вµs diff 19Вµs
align 2048 pre 581Вµs on 581Вµs post 581Вµs diff -479ns