--- a/atacmds.h
+++ b/atacmds.h
@@ -125,7 +125,6 @@
 
 // Needed parts of the ATA DRIVE IDENTIFY Structure. Those labeled
 // word* are NOT used.
-#pragma pack(1)
 struct ata_identify_device {
   unsigned short words000_009[10];
   unsigned char  serial_no[20];
@@ -147,7 +146,6 @@
 ASSERT_SIZEOF_STRUCT(ata_identify_device, 512);
 
 /* ata_smart_attribute is the vendor specific in SFF-8035 spec */ 
-#pragma pack(1)
 struct ata_smart_attribute {
   unsigned char id;
   // meaning of flag bits: see MACROS just below
@@ -208,7 +206,6 @@
 
 // Format of data returned by SMART READ DATA
 // Table 62 of T13/1699-D (ATA8-ACS) Revision 6a, September 2008
-#pragma pack(1)
 struct ata_smart_values {
   unsigned short int revnumber;
   struct ata_smart_attribute vendor_attributes [NUMBER_ATA_SMART_ATTRIBUTES];
@@ -241,7 +238,6 @@
 */
 
 /* Vendor attribute of SMART Threshold (compare to ata_smart_attribute above) */
-#pragma pack(1)
 struct ata_smart_threshold_entry {
   unsigned char id;
   unsigned char threshold;
@@ -252,7 +248,6 @@
 
 /* Format of Read SMART THreshold Command */
 /* Compare to ata_smart_values above */
-#pragma pack(1)
 struct ata_smart_thresholds_pvt {
   unsigned short int revnumber;
   struct ata_smart_threshold_entry thres_entries[NUMBER_ATA_SMART_ATTRIBUTES];
@@ -264,7 +259,6 @@
 
 
 // Table 42 of T13/1321D Rev 1 spec (Error Data Structure)
-#pragma pack(1)
 struct ata_smart_errorlog_error_struct {
   unsigned char reserved;
   unsigned char error_register;
@@ -283,7 +277,6 @@
 
 
 // Table 41 of T13/1321D Rev 1 spec (Command Data Structure)
-#pragma pack(1)
 struct ata_smart_errorlog_command_struct {
   unsigned char devicecontrolreg;
   unsigned char featuresreg;
@@ -299,7 +292,6 @@
 ASSERT_SIZEOF_STRUCT(ata_smart_errorlog_command_struct, 12);
 
 // Table 40 of T13/1321D Rev 1 spec (Error log data structure)
-#pragma pack(1)
 struct ata_smart_errorlog_struct {
   struct ata_smart_errorlog_command_struct commands[5];
   struct ata_smart_errorlog_error_struct error_struct;
@@ -308,7 +300,6 @@
 ASSERT_SIZEOF_STRUCT(ata_smart_errorlog_struct, 90);
 
 // Table 39 of T13/1321D Rev 1 spec (SMART error log sector)
-#pragma pack(1)
 struct ata_smart_errorlog {
   unsigned char revnumber;
   unsigned char error_log_pointer;
@@ -405,7 +396,6 @@
 
 
 // Table 45 of T13/1321D Rev 1 spec (Self-test log descriptor entry)
-#pragma pack(1)
 struct ata_smart_selftestlog_struct {
   unsigned char selftestnumber; // Sector number register
   unsigned char selfteststatus;
@@ -418,7 +408,6 @@
 ASSERT_SIZEOF_STRUCT(ata_smart_selftestlog_struct, 24);
 
 // Table 44 of T13/1321D Rev 1 spec (Self-test log data structure)
-#pragma pack(1)
 struct ata_smart_selftestlog {
   unsigned short int revnumber;
   struct ata_smart_selftestlog_struct selftest_struct[21];
@@ -467,7 +456,6 @@
 ASSERT_SIZEOF_STRUCT(ata_smart_extselftestlog, 512);
 
 // SMART LOG DIRECTORY Table 52 of T13/1532D Vol 1 Rev 1a
-#pragma pack(1)
 struct ata_smart_log_entry {
   unsigned char numsectors;
   unsigned char reserved;
@@ -475,7 +463,6 @@
 #pragma pack()
 ASSERT_SIZEOF_STRUCT(ata_smart_log_entry, 2);
 
-#pragma pack(1)
 struct ata_smart_log_directory {
   unsigned short int logversion;
   struct ata_smart_log_entry entry[255];
@@ -485,7 +472,6 @@
 
 // SMART SELECTIVE SELF-TEST LOG Table 61 of T13/1532D Volume 1
 // Revision 3
-#pragma pack(1)
 struct test_span {
   uint64_t start;
   uint64_t end;
@@ -493,7 +479,6 @@
 #pragma pack()
 ASSERT_SIZEOF_STRUCT(test_span, 16);
 
-#pragma pack(1)
 struct ata_selective_self_test_log {
   unsigned short     logversion;
   struct test_span   span[5];