Silicon Power の microSDXC UHS-1 Speed Class 1 256GB (elite)を購入したのだが，今まで使っていた Samsung の microSDXC UHS-I Speed Class 1 128G (EVO+)と比較してなんだかもっさりしている．
CrystalDiskMark で調べた結果，以下のように Silicon Power は結構遅い．．．
Silicon Power microSDXC UHS-1 Speed Class 1 256GB (elite)
Sequential Read (Q= 32,T= 1) : 86.820 MB/s
Sequential Write (Q= 32,T= 1) : 21.993 MB/s
Random Read 4KiB (Q= 8,T= 8) : 6.187 MB/s [ 1510.5 IOPS]
Random Write 4KiB (Q= 8,T= 8) : 1.340 MB/s [ 327.1 IOPS]
Random Read 4KiB (Q= 32,T= 1) : 6.208 MB/s [ 1515.6 IOPS]
Random Write 4KiB (Q= 32,T= 1) : 1.319 MB/s [ 322.0 IOPS]
Random Read 4KiB (Q= 1,T= 1) : 5.466 MB/s [ 1334.5 IOPS]
Random Write 4KiB (Q= 1,T= 1) : 1.236 MB/s [ 301.8 IOPS]
Samsung microSDXC UHS-I Speed Class 1 128G (EVO+)
Sequential Read (Q= 32,T= 1) : 87.620 MB/s
Sequential Write (Q= 32,T= 1) : 63.907 MB/s
Random Read 4KiB (Q= 8,T= 8) : 5.574 MB/s [ 1360.8 IOPS]
Random Write 4KiB (Q= 8,T= 8) : 2.594 MB/s [ 633.3 IOPS]
Random Read 4KiB (Q= 32,T= 1) : 5.617 MB/s [ 1371.3 IOPS]
Random Write 4KiB (Q= 32,T= 1) : 2.552 MB/s [ 623.0 IOPS]
Random Read 4KiB (Q= 1,T= 1) : 4.783 MB/s [ 1167.7 IOPS]
Random Write 4KiB (Q= 1,T= 1) : 2.430 MB/s [ 593.3 IOPS]今なら Samsung でSpeed Class 3のものもあるので，そちらにしたら良かった．以下ついでに測った NotePC の SSD．
Sequential Read (Q= 32,T= 1) : 508.879 MB/s
Sequential Write (Q= 32,T= 1) : 191.672 MB/s