`hdparm -t` on the current Samsung PRO U1 microSD card:
Timing buffered disk reads: 116 MB in 3.01 seconds = 38.48 MB/sec
I'm using the Raspberry Pi Imager v1.7.2 to write the "USB Boot" utility to a spare microSD card. This changes the boot priority to prefer USB. https://www.tomshardware.com/how-to/boot-raspberry-pi-4-usb
@annika Etcher is so nice. I wish they hadn't gone the adware route. I'd gladly pay them for their product!
@annika I'm glad to read that. I have a couple of Pi that I need to change from SD card boot to something with longer term stability. I was thinking of using a m.2 SSD in one of these cheap USB adapter cases.
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