引用:
|
作者浮出水面
你拿傳統硬碟跟SSD比？兩者的ECC處理能力天差地遠，你真的好意思拿來比？別人我不知道，但我知道PLEXTOR為了強化其ECC處理能力還特地開發了獨家的 Robust Data Hold-out Algorithm 技術來專程伺候 Toshiba 19nm Flash，只有你還天真的把SSD的ECC看成是類似記憶體ECC的小角色 
其他前面已說過我懶得重複了，你愛怎樣嚕我懶得理了，反正糟蹋的又不是我的SSD何必浪費這精神跟你耗 |
恩，你搬了 Robust Data Hold-out Algorithm 出來。
但請問這跟rockjimmy友人所遭遇 Apacer A7 Pro 寫入下降有什麼關係？
至於兩者的ECC處理能力天差地遠喔，來點佐證看看吧。
NAND FLASH的spare
美光的
PDF
引用:
|
作者TN-29-07: Small-Block vs. Large-Block NAND Flash Devices
Small-block NAND Flash devices contain blocks made up of 32 pages, where each page
contains 512 data bytes + 16 spare bytes. Large-block NAND Flash devices contain
blocks made up of 64 pages, each page containing 2,048 data bytes + 64 spare bytes.
|
傳統硬碟的ECC
Seagate的
文件
引用:
|
作者Seagate
In Figure 4, the legacy 512-byte sector layout is shown, where each 512-byte sector has non-data-related overhead of 50 bytes for ECC and another 15 bytes for the Gap, Sync and Address Mark sections. This yields a sectorized1 format efficiency of about 88 percent (512/(512 65)).
Figure 4. Legacy 512-Byte Sector Layout
The new Advanced Format standard makes the move to a 4K-byte sector, which essentially combines eight legacy 512-byte sectors into a single 4K-byte sector (Figure 5).
Figure 5. Advanced Format: 4K-Byte Sector Layout
The Advanced Format standard uses the same number of bytes for Gap, Sync and Address Mark, but increases the ECC field to 100 bytes. This yields a sectorized 1 format efficiency of 97 percent (4096/(4096 115)), almost a 10 percent improvement.
|
一個page 4k的Flash其spare應該都是128byte左右，
比起傳統硬碟的100byte，請問ECC處理是有多『天差地遠』，
這可不是好不好意思的問題，麻煩可以提供一些佐證讓我學習一下嗎。
否則多28byte就可以造成『天差地遠』的保護，傳統硬碟廠商真是太不用心了。