Advanced Host Controller Interface: A hardware mechanism that allows software to communicate with Serial ATA devices such as host bus adapters which are designed to offer features not offered by Parallel ATA controllers besides higher speeds, such as hot-plugging and native command queuing.

When you try to install Windows Vista on a portable computer that uses an ATI SB600 Series chipset, each driver may take a long time to install. Therefore, the Windows Vista installation process may take several hours.

This problem occurs only on a computer that uses a Serial Advanced Technology Attachment (SATA) device that is operating in Advanced Host Controller Interface (AHCI) mode. This problem does not occur if the SATA device uses SATA Combined mode or Parallel Advanced Technology Attachment (PATA) mode.