Thanks Fulvio for your reply.
I haved tested my Zeroshell SATA disk with another motherboard and booted fine!
The motherboard is a PCChips M955G with a VIA SATA controller, so It could be a problem with the sata driver used.
Maybe the sata_nv.ko or the ahci.ko drivers ( I think that the last nVidia chipsets are using AHCI) have some bug.
I´ll try to contact to the driver’s mantainer ( Jeff Garzik http://linux-ata.org/ ) regarding this.
Thanks again