usbドライブが/dev/sdXの時、dd if=/dev/zero of=/dev/sdX のようにすることで、usbドライブを簡易消去できる。
# fdisk /dev/sdX -l Disk /dev/sdX: 956 MiB, 1002438656 bytes, 1957888 sectors Disk model: USB DISK Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x68138bae Device Boot Start End Sectors Size Id Type /dev/sdX1 * 0 2303807 2303808 1.1G 0 Empty /dev/sdX2 248 3127 2880 1.4M ef EFI (FAT-12/16/32) # dd if=/dev/zero of=/dev/sdX bs=1M status=progress 779091968 bytes (779 MB, 743 MiB) copied, 1 s, 779 MB/s dd: error writing '/dev/sdX': No space left on device 957+0 records in 956+0 records out 1002438656 bytes (1.0 GB, 956 MiB) copied, 276.844 s, 3.6 MB/s # fdisk /dev/sdX -l Disk /dev/sdX: 956 MiB, 1002438656 bytes, 1957888 sectors Disk model: USB DISK Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes