Yiorgos Adamopoulos wrote: According to ata(4) SiS 5591 is supported at its maximum speed. However, unless I set hw.ata.ata_dma=0 at /boot/loader.conf.local I get: ad0: READ command timeout tag=0 serv=0 - resetting ata0: resetting devices .. broken chipset or bad cable. Nothing new :) old VIA chipsets often neeeded such tweaks.