Disk check

Bad blocks

badblocks is used to search for bad blocks on a device. It can be installed on NetBSD with:

pkgin install e2fsprogs

or on macOS with:

brew install e2fsprogs

A test can be launched by executing the following command:

# Device must first be unmounted on macOS
sudo diskutil unmountDisk /dev/<device>
badblocks -n -s -v /dev/<device>

where <device> can be identified by executing:

dmesg | tail

right after plugging in the USB flash storage on GNU/Linux or NetBSD and

diskutil list

on macOS.