My friend gave me his HDD to test it before I can buy it. It’s WD2500KS SATA.
I plugged it into SATA with no jumper, so it is in slave position. I assume this HDD has NCQ support. The U-DMA setting keeps going low till it drops to PIO mode. I googled the thing and I ran across this: http://www.ntcompatible.com/SATA_Hard_Disk_going_PIO_Mode_t31322.html
I wanted to defragment the disk since it is 15 % fragmented on both partitions but the operation slows down in a matter of second, sometimes even my computer crashes.
Is there anything to avoid NCQ so I can use it properly? He’s selling it really cheap and I need extra capacity asap.