diff --git a/a/drivedb.h b/b/drivedb.h
index f87fba7..b84117d 100644
--- a/a/drivedb.h
+++ b/b/drivedb.h
@@ -90,7 +90,8 @@ const drive_settings builtin_knowndrives[] = {
   },
   { "Crucial/Micron RealSSD C300/C400",
     "C300-CTFDDA[AC](064|128|256)MAG|" // Marvell 88SS9174 BJP2, tested with C300-CTFDDAC128MAG/0002
-    "C400-MTFDDA[ACK](064|128|256|512)MAM", // tested with C400-MTFDDAC256MAM/0002
+    "C400-MTFDDA[ACK](064|128|256|512)MAM|" // tested with C400-MTFDDAC256MAM/0002
+    "M4-CT(064|128|256)M4SSD2", // tested with M4-CT064M4SSD2/0002
     "", "",
   //"-v 1,raw48,Raw_Read_Error_Rate "
   //"-v 5,raw48,Reallocated_Sector_Ct "
@@ -101,7 +102,7 @@ const drive_settings builtin_knowndrives[] = {
     "-v 172,raw48,Erase_Fail_Count "
     "-v 173,raw48,Wear_Levelling_Count "
     "-v 174,raw48,Unexpect_Power_Loss_Ct "
-    "-v 181,raw48,Non4k_Aligned_Access "
+    "-v 181,raw16,Non4k_Aligned_Access "
     "-v 183,raw48,SATA_Iface_Downshift "
   //"-v 184,raw48,End-to-End_Error "
     "-v 189,raw48,Factory_Bad_Block_Ct "