ata2: timeout waiting for write DRQ

[sdat]

Hello,
I have experienced some problems with the NVIDIA GeForce 6100 in the freenas 8.0-586.

My hardware:

motherboard: K8NF6P-VSTA
Sempron 3000+ (1,8Ghz)
memory: 512MB
boot: USB stick kingston 1GB
CDRom: asus model dvd-rom sata
lan: 2 x Intel <EXPI9301CT> Gigabit Desktop Adapter PCI-E x1 10/100/1000Mbps

3 x Samsung HD204UI 2TB Hard Drives
power: 550W fsp

Setting: all HHD drives in RAIDZ ZFS pool.

The errors I see after the reboot:

ata2: timeout waiting for write DRQ
(pass0:ata2:0:0:0): SETFEATURES. ACB: ef 85 00 00 00 40 00 00 00 00 00 00 (pass0:ata2:0:0:0): CAM status: CCB request completed with an error
Failed to configure APM: No such file or directory
ata3: timeout waiting for write DRQ
(pass0:ata3:0:0:0): SETFEATURES. ACB: ef 85 00 00 00 40 00 00 00 00 00 00 (pass0:ata3:0:0:0): CAM status: CCB request completed with an error
Failed to configure APM: No such file or directory
ata4: timeout waiting for write DRQ


after this message, then the download is not.

Thanks.