FWIW, Something else that can (sometimes) be informative if you have access to another Pi that is not booting via a uSD card (ie. booting from USB storage perhaps) is to put the uSD card in said Pi's card slot, boot from USB and then post (here) the output ofYou've only tested roughly 2GB of the drive. I don't think H2testw has the smart behaviour of f3probe to test drives with a smaller set of writes. I believe you need to test the entire drive if using H2testw, or at least more than the typical size of fakes, which will take a while. The fake cards typically use a low-spec and small capacity real card with the firmware tweaked to make it look like a large card. You need to write more data than the size of the real card to detect a fake. E.g. if you have been sold an 8GB card that's pretending to be a 1TB card, you'd need to write more than 8GB (but you don't know in advance what size of card they used, so you might need to write more than 16GB or 32GB).Warning: Only 2071 of 1023982 MByte tested.
Test finished without errors.
Reading speed: 14.7 MByte/s
H2testw v1.4
14.7 MB/s read speed is on the low side for good microSD cards. It's not wholly conclusive, as there are multiple different causes of slow performance, but it can be a sign that the card is fake (or very low spec). E.g. here's a SanDisk Edge 16GB card in a Pi4, with more than double that read speed (limited by the Pi4's SD performance):Code:
murph@raspberrypi:~ $ sudo dd if=/dev/mmcblk0 of=/dev/null bs=1M count=10241024+0 records in1024+0 records out1073741824 bytes (1.1 GB, 1.0 GiB) copied, 32.7911 s, 32.7 MB/smurph@raspberrypi:~ $
Code:
cat /sys/block/mmcblk0/device/cidhttps://www.cpmspectrepi.uk/raspberry_p ... dInfo.html
https://www.cpmspectrepi.uk/raspberry_p ... cking.html
Trev.
Statistics: Posted by FTrevorGowen — Sat Feb 01, 2025 2:46 pm