好讀：https://www.ptt.cc/bbs/Storage_Zone/M.1515761041.A.A14.html
買 SanDisk 家的記憶卡這麼多年，把經手過的測速成績做個簡單分享
以下原則上從新到舊、高階到低階排列，均格式化為 exFAT
平台：ASUS P8H67 with AsMedia U3
讀卡機：Kingston MobileLite G4
測試軟體：CrystalDiskMark 3.0.4 x64
系統：Win7 Pro 64-bit
● SanDisk Extreme PRO microSDXC 64GB V30/A1
https://images2.imgbox.com/12/6d/v4mDi45e_o.jpg
https://images2.imgbox.com/2e/15/pK90FrCq_o.jpg
原廠標示讀寫速度為 100MB/90MB
● SanDisk Extreme microSDHC 32GB
https://images2.imgbox.com/68/77/40LSRU7M_o.jpg
https://images2.imgbox.com/4e/60/XDUs1QoY_o.jpg
標示讀寫為 45MB/45MB
● SanDisk Extreme microSDHC 16GB
https://images2.imgbox.com/3c/47/Aja4vNn3_o.jpg
https://images2.imgbox.com/9f/03/AgaIZs1h_o.jpg
這張是當年 Extreme Plus 包成 Extreme 那批
標示讀寫為 45MB/30MB
● SanDisk Ultra microSDHC 32GB 80MB/s 白灰
https://images2.imgbox.com/48/f4/wyixyGoQ_o.jpg
https://images2.imgbox.com/ba/da/Q6QETho9_o.jpg
標示讀速為 80MB/s，等同於紅灰 80MB 版馬甲
Ultra 等級一律只保證讀速，寫速符合 UHS-I/C10 等級
● SanDisk Ultra microSDHC 32GB 80MB/s 紅灰
https://images2.imgbox.com/37/db/HvGIO7XN_o.jpg
https://images2.imgbox.com/98/5b/PsvjVFe3_o.jpg
標示讀取為 80MB/s
受限於顆粒配置，紅灰要到 64GB 寫速才會突破 10MB/s
● SanDisk Ultra microSDHC 16GB 80MB/s 紅灰
https://images2.imgbox.com/f5/b6/LPnn9A9d_o.jpg
https://images2.imgbox.com/78/42/9Hmfowms_o.jpg
標示讀取為 80MB/s
● SanDisk Ultra microSDHC 16GB 30MB/s 紅灰
https://images2.imgbox.com/ea/9e/KYZaRlyp_o.jpg
https://images2.imgbox.com/1d/96/fSrSUxnX_o.jpg
為 Ultra 早期產品，標示讀取為 30MB/s
● SanDisk Ultra microSDHC 32GB 30MB/s 黑卡
https://images2.imgbox.com/51/df/2JMwgB5S_o.jpg
https://images2.imgbox.com/ee/ab/AbyIAiwc_o.jpg
這張是白灰的前身，標示讀取為 30MB/s
(同期紅灰為 48MB/s)
● SanDisk Mobile Ultra microSDHC 16GB 30MB/s
https://images2.imgbox.com/33/d4/9npQwDPU_o.jpg
https://images2.imgbox.com/a7/63/9ciG5T05_o.jpg
紅灰最早期的產品，效能與今日不可同日而語
以上，希望對各位有幫助