diff --git a/t/zbd/functions b/t/zbd/functions
index 812320f529..9a6d699910 100644
--- a/t/zbd/functions
+++ b/t/zbd/functions
@@ -238,18 +238,40 @@ max_open_zones() {
     fi
 }
 
+# Get minimum block size to write to seq zones. Refer the sysfs attribute
+# zone_write_granularity which shows the valid minimum size regardless of zoned
+# block device type. If the sysfs attribute is not available, refer physical
+# block size for rotational SMR drives. For non-rotational devices such as ZNS
+# devices, refer logical block size.
+min_seq_write_size() {
+	local sys_path="/sys/block/$1/queue"
+	local -i size=0
+
+	if [[ -r "$sys_path/zone_write_granularity" ]]; then
+		size=$(<"$sys_path/zone_write_granularity")
+	fi
+
+	if ((size)); then
+		echo "$size"
+	elif (($(<"$sys_path/rotational"))); then
+		cat "$sys_path/physical_block_size"
+	else
+		cat "$sys_path/logical_block_size"
+	fi
+}
+
 is_zbc() {
 	local dev=$1
 
 	[[ -z "$(${zbc_info} "$dev" | grep "is not a zoned block device")" ]]
 }
 
-zbc_logical_block_size() {
+zbc_physical_block_size() {
 	local dev=$1
 
 	${zbc_info} "$dev" |
-		grep "logical blocks" |
-		sed -n 's/^[[:blank:]]*[0-9]* logical blocks of[[:blank:]]*//p' |
+		grep "physical blocks" |
+		sed -n 's/^[[:blank:]]*[0-9]* physical blocks of[[:blank:]]*//p' |
 		sed 's/ B//'
 }
 
diff --git a/t/zbd/test-zbd-support b/t/zbd/test-zbd-support
index 7b229002c5..996160e769 100755
--- a/t/zbd/test-zbd-support
+++ b/t/zbd/test-zbd-support
@@ -1427,7 +1427,7 @@ if [[ -b "$realdev" ]]; then
 		realsysfs=$(readlink "/sys/dev/block/$major:$minor")
 		basename=$(basename "${realsysfs%/*}")
 	fi
-	min_seq_write_size=$(<"/sys/block/$basename/queue/logical_block_size")
+	min_seq_write_size=$(min_seq_write_size "$basename")
 	case "$(<"/sys/class/block/$basename/queue/zoned")" in
 	host-managed|host-aware)
 		is_zbd=true
@@ -1476,8 +1476,8 @@ elif [[ -c "$realdev" ]]; then
 		echo "Failed to determine disk size"
 		exit 1
 	fi
-	if ! min_seq_write_size=($(zbc_logical_block_size "$dev")); then
-		echo "Failed to determine logical block size"
+	if ! min_seq_write_size=($(zbc_physical_block_size "$dev")); then
+		echo "Failed to determine physical block size"
 		exit 1
 	fi
 	if ! result=($(first_sequential_zone "$dev")); then