Hard Disk problem!!

hi
I have 2 to hard disk, first Hard disk [B]Maxtor[/B] 250 gb SATA and second hard disk [B]Western digital[/B] 250 gb SATA.

Windows already installed on my second hard disk ([B]WD[/B])was working very quickly ...And when I wanted copy file system Hang and low speed for working until the end of copying files

I Install new windows on my first hard disk ([B]Maxtor[/B]) and it's very good for working but when i trying for copy file to second hard disk (WD) i have this problem again!

I Install HD-Tune 2.55 for test my second hard disk but after install and run this program my system restarted!

I try for more time for HD-Tune run but same problem!

I try for CHKDSK for all drive my second hard disk(WD) just have probelm with 1 drive:

Also i try for install and then run HDD Regenerator and restart my computer and run with boot CD and then scan started by this program... just i have 1 report D (delay detect) and no more!

My hard disk havn't Bad sector but it's very slow when i want copy file or when i install a progarm on one of drive second hard disk!

What's problem ? please help me