Discuz! Database Error

(3) Error writing file 'D:\BtSoft\mysql\MySQL5.6\data\MY6F98.tmp' (Errcode: 28 - No space left on device)

SELECT pt.tid,pt.fid,pt.author,pt.authorid,pt.subject,pt.views,pt.replies,pt.dateline,pf.name FROM forum_thread pt LEFT JOIN forum_forum pf USING(fid) WHERE fid not in(140) and pt.displayorder>=0 ORDER BY dateline DESC limit 54350, 50

PHP Debug

No.	File	Line	Code
1	plugin.php	47	include(%s)
2	source/plugin/kx_new100/kx_new100.inc.php	23	discuz_database::query(%s, Array)
3	source/class/discuz/discuz_database.php	142	db_driver_mysqli->query(%s, false, false)
4	source/class/db/db_driver_mysqli.php	148	db_driver_mysqli->halt(%s, %d, %s)
5	source/class/db/db_driver_mysqli.php	223	break()