Writing Speed ​​only 23 MB / s, not 45 MB / s

My speed tests show that even if the key reaches well the speed of 90 MB / s read and
even exceeds this value, going up to 105 MB / s sometimes it does not reach the speed décriture
Promised. I tried on several machines with USB 3.0 of course, Windows and Linux. In the
optimal conditions and without any Linux file system in just treating it as a key
Block mode device "raw", one reaches 23 MB / s max. The things only deteriorate in
partitioning and putting a file system.

Also the key provides less space than the same capacity SD card that I wanted
clone, hence the need to play with gparted (1) Linux to reduce the size of
original partition before copying.

Fdisk result with the original configuration, for the curious:

Disk / dev / sdc: 31.6 GB, 31591497728 bytes
255 heads, 63 sectors / track, 3840 cylinders, total 61,702,144 Sectors
Sectors of Units = 1 * 512 = 512 bytes
Sector size (logical / physical): 512 bytes / 512 bytes
I / O size (minimum / maximum): 512 bytes / 512 bytes
Disk identify: 0xc3072e18

Device Boot Start End Blocks Id System
/ Dev / sdc1 32 61,702,143 30,851,056 c W95 FAT32 (LBA)