See also Network Attached Storage /nas.

Brands of SSD/U-Disk

• Avoid: n 金 n 云, WD Green=SanDisk Plus(加强版)= just a big U-disk (U-disk controller, high delay, low seq. write speed, but seq. read speed is ok, overall speed is about x2~x4 HDD). Also: 海康、大唐的虚假宣传问题
• At least: Toshiba/铠侠 TR200/TC10, 紫光S100, 浦科特 M8V, Intel 660P (warn: 660P tested bad)。
• General: Crucial MX500, WD Blue = SanDisk 3D（不是加强版）, Toshiba Q200EX, Intel 545S, Also: Samsung 860EVO。
• Better: WD Black SN750 (code data issue), Intel Enterprise Level. extra: Samsung 860PRO。
• 鲶鱼？: 海盗船 MP510/600。

卡饭 bbs 2020.06
zhihu 2021.11

Lifespan

optical disk

Normal organic material optical disk can save data for 2~5 years (up to 20). Blue-ray disk (BD, 25GB) uses inorganic material and can save for 50 years (or higher up to 200 years with special techniques as some companies claim). M-Disc can be up to 500 years (the so-called thousand-year disk).

Optical disks may require regular re-backups.ref

ref: BD 7 years conditions, comparing several brands

ssd

SSD, as required, can save data for 1 year under 30℃, 2 years under 25 ℃ (usually with 500 times PE writing). A new SSD can save for 10 years. ref.

hdd

Maybe 1% error per year. May have unreoverable error if longer than 10 years. ???

lifespan ref

如何长时间保存重要数据？
硬盘和光盘的存储数据寿命哪个更长、更可靠?
閒聊 Plextor M7V 破 5000 P/E 後的性能表現