You should get a fast A1 rated micro SD card for now, because USB booting has not been enabled in the Pi4 firmware yet. SD card performance has been improved as well (compared to older models), but the Pi computers don't officially support any of the UHS standards, as far as I know.
Or you opt for an SBC which just offers native NVMe support?HawaiianPi wrote: ↑Sun Jun 30, 2019 6:30 amTo get higher 10Gbps speeds you would need an NVMe SSD and a USB 3.1 Gen 2 NVMe enclosure (expensive) and, of course, you'd need a USB 3.1 Gen 2 device to plug it into. The whole chain (drive, enclosure, cable and device) all have to support the faster standard.
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sudo hdparm -tT /dev/sda1 /dev/sda1: Timing cached reads: 1308 MB in 2.00 seconds = 653.88 MB/sec Timing buffered disk reads: 730 MB in 3.00 seconds = 243.18 MB/sec