write_torture.sh

#!/bin/bash
# Script that runs a write endurance torture test, intended to measure SD card endurance.
# Like "Anvil's Storage Utilities" endurance test for command line Linux

# Check if running as root
if [[ "$(id -u)" -ne 0 ]]; then
  echo "ERROR: Must be run as root" >&2
  exit 2
fi

# Check required dependencies
readonly DEPENDENCIES='badblocks'
for dependency in ${DEPENDENCIES}; do
  if ! command -v "${dependency}" > /dev/null 2>&1; then
    echo "ERROR: Command '${dependency}' not found" >&2
    exit 2
  fi
done

COUNT_FILE="$HOME/.endurancecounter"

if [[ -s $COUNT_FILE ]]; then
    read COUNT < "$COUNT_FILE"
fi

if echo "$COUNT" | grep '[^0-9]' > /dev/null; then
    echo >&2 "$0: ERROR: non-integer counter found in $COUNT_FILE."
    exit 1
elif [[ -z $COUNT ]]; then
    COUNT=1
fi

# 20TBW / 32GB = 640 cycles
for (( ; COUNT < 641; COUNT++ ))
do
    echo "Run: $COUNT"
    badblocks -b 4096 -c 4096 -t random -e 1 -v -s -w /dev/sda
    if [[ $? != 0 ]]; then exit 2
    fi
    # maybe it's better to increase the randomness of the data written
    # head -c 1G </dev/urandom >myfile
    # head -c 1G </dev/hwrng >myfile
    echo $(( COUNT )) > "$COUNT_FILE"
done