What happens when repair a 2Gb MyISAM table

repair-output

mysql> repair table dbdemo.table;
+---------------+--------+----------+-------------------------------------------------------------------+
| Table         | Op     | Msg_type | Msg_text                                                          |
+---------------+--------+----------+-------------------------------------------------------------------+
| dbdemo.table  | repair | info     | Key 1 - Found wrong stored record at 381432048                    |
| dbdemo.table  | repair | info     | Key 1 - Found wrong stored record at 390303976                    |
| dbdemo.table  | repair | info     | Wrong aligned block at 391242113                                  |
| dbdemo.table  | repair | info     | Delete link points outside datafile at 391242113                  |
| dbdemo.table  | repair | info     | Key 1 - Found wrong stored record at 393273584                    |
| dbdemo.table  | repair | info     | Key 1 - Found wrong stored record at 396046628                    |
| dbdemo.table  | repair | info     | Key 1 - Found wrong stored record at 594145524                    |
| dbdemo.table  | repair | info     | Wrong aligned block at 602284419                                  |
| dbdemo.table  | repair | info     | Wrong bytesec:  48- 55- 53 at 602284419; Skipped                  |
| dbdemo.table  | repair | info     | Key 1 - Found wrong stored record at 607154412                    |
| dbdemo.table  | repair | info     | Wrong aligned block at 607322499                                  |
| dbdemo.table  | repair | info     | Wrong bytesec:  48- 55- 50 at 607322499; Skipped                  |
| dbdemo.table  | repair | info     | Wrong aligned block at 608432513                                  |
| dbdemo.table  | repair | info     | Wrong bytesec: 248-  8- 52 at 608432513; Skipped                  |
| dbdemo.table  | repair | info     | Key 1 - Found wrong stored record at 608518416                    |
| dbdemo.table  | repair | warning  | Duplicate key for record at 393852452 against record at 393818024 |
| dbdemo.table  | repair | warning  | Duplicate key for record at 604802700 against record at 472148116 |
| dbdemo.table  | repair | warning  | Number of rows changed from 9628140 to 16594799                   |
| dbdemo.table  | repair | status   | OK                                                                |
+---------------+--------+----------+-------------------------------------------------------------------+
19 rows in set (6 min 53.91 sec)