SMR、氦氣與大容量硬碟發展的看法 - 儲存設備

: → apharomeo : Seagate 2.5吋7mm 2TB ST2000LM007 就是SMR 11/12 01:50
: → apharomeo : 同樣 Seagate 2.5吋7mm 1T ST1000LM035 也是SMR 11/12 01:51
: → xxp : No 依照原廠資料的話 這兩顆一樣是PMR 11/12 10:52
: → xxp : http://goo.gl/ve9E8o 只是密度更高達到1320Gb/in2 11/12 10:53
: → xxp : 完了 SG鬧雙胞 http://goo.gl/3EkpgS 這邊又寫SMR 11/12 10:56
: → apharomeo : 應該還是SMR，垂直記錄的SMR，有點像文字遊戲 11/12 14:16
: → apharomeo : 可參考這篇討論 http://goo.gl/emJnkV 11/12 14:17
: → xxp : 那ST4000LM016那顆是不是PMR變得也無法確定了 11/12 14:35
: → xxp : 兩者的寫法是一樣的 剛剛寫信去給Seagate了 等候中 11/12 14:37
: → glen246 : http://tinyurl.com/h4us7s9 11/12 17:51
: → glen246 : 新版datasheet居然把SMR那項移除掉了，真奇怪 11/12 17:54
: → apharomeo : 有一種打迷糊仗的感覺，也許想搞換技術不換型號那招 11/12 19:49

收到原廠回應了
Dear:

Thank you for contacting Seagate Support.

The data sheet you linked to is an older one and not the current data sheet,
which does not mention it.

Recent updates to SMR technology has brought it to the point it functions
nearly identically to PMR so there is no functional difference in performance
anymore. Early versions of SMR did lag in performance behind PMR, but this
is no longer the case.

If you look at the old data sheet vs the new data sheet, you will notice the
data transfer rate changes from 100MB/s to 140MB/s, in line with standard PMR
drives.
(幫縮) http://goo.gl/3EkpgS (old)
(幫縮) http://tinyurl.com/h4u (new)

The product manual confirms the same data as the new data sheet.
(幫縮) http://goo.gl/59gTMJ (這份應該是最新的2016/9月版Manual)

As there is no functional difference, none of our internal listings for any
drive show whether they are SMR or PMR. It no longer makes a difference in
how the drive performs.


簡單來說，就是Seagate認為他們已經改善了早期SMR效能較差的缺點

目前SMR和PMR的表現沒有顯著差異

所以沒有必要再去標示是SMR還是PMR

也把規格100MB/s上修為140MB/s

Mmm..雖然沒有明講 但也算是曖昧的間接承認是SMR了

未來恐怕也難以再從Manual上看出是SMR還是PMR了

...好想弄一顆來測看看是不是真的如原廠所說的沒有差異...

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