Index: camcontrol.c
===================================================================
--- camcontrol.c
+++ camcontrol.c
@@ -2292,7 +2292,7 @@
 				 /*command*/command,
 				 /*features*/0,
 				 /*lba*/0,
-				 /*sector_count*/(u_int8_t)sizeof(struct ata_params),
+				 /*sector_count*/1,
 				 /*data_ptr*/(u_int8_t *)ptr,
 				 /*dxfer_len*/sizeof(struct ata_params),
 				 /*timeout*/timeout ? timeout : 30 * 1000,
@@ -2312,8 +2312,7 @@
 					 /*command*/retry_command,
 					 /*features*/0,
 					 /*lba*/0,
-					 /*sector_count*/(u_int8_t)
-					     sizeof(struct ata_params),
+					 /*sector_count*/1,
 					 /*data_ptr*/(u_int8_t *)ptr,
 					 /*dxfer_len*/sizeof(struct ata_params),
 					 /*timeout*/timeout ? timeout : 30 * 1000,