Acer Aspire M5640 Service Guide for Aspire M1640 / M3640 / M5640 - Page 39

The following table describes the parameters found in this menu. Parameter IDE Primary/Second ary Master/Slave PIO On-Chip IDE First/Second Channel IDE Primary/Second ary Master/Slave UDMA IDE DMA Transfer Access Description The four IDE PIO fields let you set a PIO mode (0-4) for each of the four IDE devices that the onboard IDE interface supports. Modes 0 through 4 provide increased performance. In Auto mode, the system automatically determines the best mode for each device. The Chipset contains a PCI IDE interface with support for two IDE channels. Select Enabled to activate the first and/or second IDE interface. Select Disabled to deactivate an interface, if you install a primary and/or secondary add-in IDE interface. UDMA (Ultra DMA) is a DMA data transfer protocol that utilized ATA transfer protocol that utilizes ATA commands and the ATA bus to allow DMA commands to transfer data ata maximum burst rate of 33 MB/s. When you select Auto in the four IDE UDMA fields (for each of up to four IDE devices that the internal PCI IDE interface supports), the system automatically determines the optimal data transfer rate for each IDE device. This category allows you to enable or disable DMA transfer access of IDE device (or IDE HDD) Options [Enabled], [Disabled] [Enabled], [Disabled] SATA 1/2 IDE Prefetch Mode Enable/Disable Serial-ATA 1 or Serial-ATA-2. SATA 1 control port 1 and 3, SATA 2 control port 2 and 4. The onboard IDE drive interfaces supports IDE prefetching, for faster drive accesses. If you install a primary and/or secondary add-in IDE interface, set this field to Disabled if the interface does not support prefetching. 33