好读：https://www.ptt.cc/bbs/PC_Shopping/M.1515761612.A.4E5.html
买 SanDisk 家的记忆卡这么多年，把经手过的测速成绩做个简单分享
以下原则上从新到旧、高阶到低阶排列，均格式化为 exFAT
平台：ASUS P8H67 with AsMedia U3
读卡机：Kingston MobileLite G4
测试软件：CrystalDiskMark 3.0.4 x64
系统：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
原厂标示读写速度为 100MB/90MB
● SanDisk Extreme microSDHC 32GB
https://images2.imgbox.com/68/77/40LSRU7M_o.jpg
https://images2.imgbox.com/4e/60/XDUs1QoY_o.jpg
标示读写为 45MB/45MB
● SanDisk Extreme microSDHC 16GB
https://images2.imgbox.com/3c/47/Aja4vNn3_o.jpg
https://images2.imgbox.com/9f/03/AgaIZs1h_o.jpg
这张是当年 Extreme Plus 包成 Extreme 那批
标示读写为 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
标示读速为 80MB/s，等同于红灰 80MB 版马甲
Ultra 等级一律只保证读速，写速符合 UHS-I/C10 等级
● SanDisk Ultra microSDHC 32GB 80MB/s 红灰
https://images2.imgbox.com/37/db/HvGIO7XN_o.jpg
https://images2.imgbox.com/98/5b/PsvjVFe3_o.jpg
标示读取为 80MB/s
受限于颗粒配置，红灰要到 64GB 写速才会突破 10MB/s
● SanDisk Ultra microSDHC 16GB 80MB/s 红灰
https://images2.imgbox.com/f5/b6/LPnn9A9d_o.jpg
https://images2.imgbox.com/78/42/9Hmfowms_o.jpg
标示读取为 80MB/s
● SanDisk Ultra microSDHC 16GB 30MB/s 红灰
https://images2.imgbox.com/ea/9e/KYZaRlyp_o.jpg
https://images2.imgbox.com/1d/96/fSrSUxnX_o.jpg
为 Ultra 早期产品，标示读取为 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
这张是白灰的前身，标示读取为 30MB/s
(同期红灰为 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
红灰最早期的产品，效能与今日不可同日而语
以上，希望对各位有帮助