1026 - Error writing file '\WINNT\TEMP\xxx ' (errcode: 28)

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The error message is generated by MySQL server.

Error 28 indicated that your harddisk has no enough space for a temp file. The temp file is used by MySQL server where it stores query result in this temp file.

For more information, please kindly visit at http://dev.mysql.com/doc/refman/5.1/en/cannot-create.html