Transcend 64 GB SDXC Memory Card Class 10 UHS-I 300x TS64GSDU1E [Packaging "Free Packaging Amazon Frustration"] (Personal Computers)
Judge for yourself: CrystalDiskMark 3.0.3 Sequential Read: 69 254 MB / s Sequential Write: 59,430 MB / s 512KB Random Read: 66222 MB / s 512KB Random Write: 28,821 MB / s 4KB Random Read (QD = 1): 5.346 MB / s [1305.1 IOPS] 4KB Random Write (QD = 1):