diff --git a/README.md b/README.md
index d0ce6f4..406a1d0 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ The script calls `sleep` after starting each SMART test, using a duration based
 Full SMART information is pulled after each SMART test. All output except for the `sleep` command is echoed to both the screen and log file.
 
 You should periodically monitor the burn-in progress and check for errors, particularly any errors reported by `badblocks`, or these SMART errors:
-  
+
 |ID|Attribute Name|
 |---:|---|
 |  5|Reallocated_Sector_Ct|
@@ -41,8 +41,9 @@ The script extracts the drive model and serial number and creates a log filename
 
 `badblocks` is invoked with the following options:
 
-* `-b 8192` : Use a block size of 8192
+* `-b 8192` : Use a block size of 8192 (override this setting with the `-b` option below)
 * `-e 1` : Abort the `badblocks` test immediately if an error is found (override this setting with the `-x` option below)
+* `-c 64` : Number of concurrent blocks to check. (override this setting with the `-c` option below, but beware of memory use with high values)
 * `-v` : Verbose mode
 * `-o` : Write list of bad blocks found (if any) to a file named `burnin-[model]_[serial number].bb`
 * `-s` : Show progress
@@ -50,12 +51,14 @@ The script extracts the drive model and serial number and creates a log filename
 
 ## Usage
 
-`./disk-burnin.sh [-h] [-e] [-f] [-o <directory>] [-x] <disk>`
+`./disk-burnin.sh [-h] [-e] [-b <block_size>] [-c <num_blocks>] [-f] [-o <directory>] [-x] <disk>`
 
 ### Options
 
 * `-h`: show help text
 * `-e`: show extended help text
+* `-b`: block size (default: 8192)
+* `-c`: number of concurrent blocks to check (default: 64). Higher values will use more memory.
 * `-f`: run a full, destructive test. Disables the default 'dry-run mode'. **ALL DATA ON THE DISK WILL BE LOST!**
 * `-o <directory>`: write log files to `<directory>` (default: working directory `$(pwd)`)
 * `-x`: perform a full pass of `badblocks`, using the `-e 0` option.
diff --git a/disk-burnin.sh b/disk-burnin.sh
index be099be..9021e32 100755
--- a/disk-burnin.sh
+++ b/disk-burnin.sh
@@ -29,7 +29,7 @@ readonly USAGE=\
     $(basename "$0") -- disk burn-in program
 
 SYNOPSIS
-    $(basename "$0") [-h] [-e] [-f] [-o <directory>] [-x] <disk>
+    $(basename "$0") [-h] [-b <block_size>] [-c <num_blocks>] [-e] [-f] [-o <directory>] [-x] <disk>
 
 DESCRIPTION
     A script to simplify the process of burning-in disks. Only intended for use
@@ -46,6 +46,8 @@ DESCRIPTION
 OPTIONS
     -h                Show help text
     -e                Show extended help text
+    -b <block_size>   Override block size (defaults to 8192)
+    -c <num_blocks>   Override concurrent number of blocks tested
     -f                Force script to run in destructive mode
                       ALL DATA ON THE DISK WILL BE LOST!
     -o <directory>    Write log files to <directory> (default: $(pwd))
@@ -218,13 +220,22 @@ VERSIONS
         Changed disk type detection so that we assume all drives are mechanical drives
         unless they explicitly return 'Solid State Drive' for Rotational Rate.
         Removed datestamp from every line of log output, only emitting it in log headers.
-        Minor reformatting."
+        Minor reformatting.
+
+    KY, 30 May 2022
+        Added -b & -c options to control respective badblocks options."
 
 # badblocks default -e option is 1, stop testing if a single error occurs
 BB_E_ARG=1
 
+# badblocks default -b option is 1024, but we default to 8192. This allows overriding if desired.
+BB_B_ARG=8192
+
+# badblocks default -c option is 64, and this allows overriding
+BB_C_ARG=64
+
 # parse options
-while getopts ':hefo:x' option; do
+while getopts ':hefo:b:c:x' option; do
   case "${option}" in
     h)  echo "${USAGE}"
         exit
@@ -237,7 +248,11 @@ while getopts ':hefo:x' option; do
         ;;
     o)  LOG_DIR="${OPTARG}"
         ;;
-    x)  BB_E_ARG=0  
+    b)  BB_B_ARG="${OPTARG}"
+        ;;
+    c)  BB_C_ARG="${OPTARG}"
+        ;;
+    x)  BB_E_ARG=0
         ;;
     :)  printf 'Missing argument for -%s\n' "${OPTARG}" >&2
         echo "${USAGE}" >&2
@@ -262,6 +277,8 @@ fi
 ################################################################################
 
 readonly BB_E_ARG
+readonly BB_B_ARG
+readonly BB_C_ARG
 
 # Drive to burn-in
 DRIVE="$1"
@@ -559,7 +576,7 @@ run_smart_test() {
 run_badblocks_test() {
   log_header "Running badblocks test"
   if [ "${DISK_TYPE}" != "SSD" ]; then
-    dry_run_wrapper "badblocks -b 8192 -wsv -e ${BB_E_ARG} -o \"${BB_File}\" \"${DRIVE}\""
+    dry_run_wrapper "badblocks -b ${BB_B_ARG} -wsv -c ${BB_C_ARG} -e ${BB_E_ARG} -o \"${BB_File}\" \"${DRIVE}\""
   else
     log_info "SKIPPED: badblocks for ${DISK_TYPE} device"
   fi