余ってたM2SSDを繋いでSambaで動かしてみた
3はログ置き場位しか使い道なかったけど、4はまぁ使おうと思えば使える、がUSB3.0の規格値考えたらもうちょっと出ないもんかね

■R3 USB2.0 SATA SSD
Sequential Read (Q= 32,T= 1) : 11.376 MB/s
Sequential Write (Q= 32,T= 1) : 11.716 MB/s
Random Read 4KiB (Q= 8,T= 8) : 11.532 MB/s [ 2815.4 IOPS]
Random Write 4KiB (Q= 8,T= 8) : 10.039 MB/s [ 2450.9 IOPS]
Random Read 4KiB (Q= 32,T= 1) : 11.511 MB/s [ 2810.3 IOPS]
Random Write 4KiB (Q= 32,T= 1) : 10.678 MB/s [ 2606.9 IOPS]
Random Read 4KiB (Q= 1,T= 1) : 2.492 MB/s [ 608.4 IOPS]
Random Write 4KiB (Q= 1,T= 1) : 2.355 MB/s [ 575.0 IOPS]

Test : 1024 MiB [X: 74.3% (27.0/36.3 GiB)] (x5) [Interval=5 sec]
Date : 2019/12/14 12:53:32
OS : Windows 10 Professional [10.0 Build 17763] (x64)

■R4 USB3.0 M,2 NVMe SSD

Sequential Read (Q= 32,T= 1) : 75.888 MB/s
Sequential Write (Q= 32,T= 1) : 55.444 MB/s
Random Read 4KiB (Q= 8,T= 8) : 37.147 MB/s [ 9069.1 IOPS]
Random Write 4KiB (Q= 8,T= 8) : 29.449 MB/s [ 7189.7 IOPS]
Random Read 4KiB (Q= 32,T= 1) : 36.248 MB/s [ 8849.6 IOPS]
Random Write 4KiB (Q= 32,T= 1) : 28.087 MB/s [ 6857.2 IOPS]
Random Read 4KiB (Q= 1,T= 1) : 3.285 MB/s [ 802.0 IOPS]
Random Write 4KiB (Q= 1,T= 1) : 3.600 MB/s [ 878.9 IOPS]

Test : 1024 MiB [Y: 7.4% (68.0/915.9 GiB)] (x5) [Interval=5 sec]
Date : 2019/12/14 12:50:45
OS : Windows 10 Professional [10.0 Build 17763] (x64)