diff --git a/init.recovery.device.rc b/init.recovery.device.rc
index 092221a..72fc15a 100644
--- a/init.recovery.device.rc
+++ b/init.recovery.device.rc
@@ -8,3 +8,7 @@ on init
     write /sys/module/msm_poweroff/parameters/warm_reset 1
     # Enable thermal mitigation
     write /sys/devices/virtual/thermal/tz-by-name/backup-charge/mode enabled
+
+    # Block layer tuning: discard chunk size up to 128MB
+    # Otherwise, contiguous discards can be merged
+    write /sys/block/sda/queue/discard_max_bytes 134217728