Block 0 of ERRLOG.DAT
+-----------------------------------------------------------+
|  Pointer to the Header Summary section in Block 0         |
+------------------------------+----------------------------+
|           Device ID          |          Unit Number       | <--+   
+------------------------------+----------------------------+    |
|               Number of error records logged              |    |
+-----------------------------------------------------------+    |
|                 Number of errors received                 |  Records 
+-----------------------------------------------------------+  For Each
|                       READ successes                      |  Error-Logging
|                         (Two words)                       |  Device  
+-----------------------------------------------------------+    |
|                       WRITE successes                     |    |
|                         (Two words)                       | <--+
+-----------------------------------------------------------+
| Total number of errors received (including occasions when | <--+
| the error logger was unable to record the error data)     |    |
+-----------------------------------------------------------+    |
| Count of missed records (not recorded because the error   |    |
| logger input buffers were full)                           |    |
+-----------------------------------------------------------+    |
| Count of missed records (not recorded because ERRLOG.DAT  |    |
| was full)                                                 |    |
+-----------------------------------------------------------+    |
| Count of missed records (not recorded because start up or |    |
| shut down was in progress)                                |    |
+-----------------------------------------------------------+    |
|               Number of memory parity errors              |    |
+-----------------------------------------------------------+    |
|                Number of cache parity errors              |  Header
+-----------------------------------------------------------+  Summary
|                 Next physical record number               |  Section
+-----------------------------------------------------------+    |
|            Block number for start of next record          |    |
+-----------------------------------------------------------+    |
|         Offset within the block for the next record       |    |
+-----------------------------------------------------------+    |
|            Maximum size of error file, in blocks          |    |
+-----------------------------------------------------------+    |
|          Configuration word 1 (monitor fixed offset 300)  |    |
+-----------------------------------------------------------+    |
|          Configuration word 2 (monitor fixed offset 370)  |    |
+-----------------------------------------------------------+    |
|                   Date of initialization                  |    |
+-----------------------------------------------------------+    |
|                   Time of initialization                  |    |
|                        (Two words)                        |    |
+-----------------------------------------------------------+ <--+