Wed Jul 14, 2021 5:34 pm
hEX S is built around MediaTek MT7621A chip, which supports USB 3.0 and SDXC. However hEX S implements USB 2.0 which means up to 480 Mbps. SDXC OTOH (the initial revision) means up to 104 MBps (which is around 830 Mbps). Meaning that SD is likely faster. But these are maximum numbers and storage implementations are usually slower than that. How much slower largely depends on particular pheripherial model (USB flash drive or SD card).
And then things come to ROS implementation of SMB (I'm assuming you want to use router as kind of NAS and SMB is often the underlying protocol). And the SMB implementation in ROS is far from being fast. Most likely it will prove to be the bottleneck with almost any pendrive chosen.
In short: ROS devices are lousy NAS devices.