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AHCI: Difference between revisions
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An AHCI controller may support up to 32 ports which can attach different SATA devices such as disk drives, port multipliers, or an enclosure management bridge. AHCI supports all native SATA features such as command queueing, hot plugging, power management, etc. To a software developer, an AHCI controller is just a PCI device with bus master capability.
AHCI is a new standard compared to IDE, which has been around for twenty years. There exists little documentation about its programming tips and tricks. Possibly the only available resource is the Intel AHCI specification (see [[#External Links|
It should be noted that IDE also supports SATA devices and there are still debates about which one, IDE or AHCI, is better. Some tests even show that a SATA disk acts better in IDE mode than AHCI mode. But the common idea is that AHCI performs better and will be the standard PC to SATA interface, though some driver software should be enhanced to fully cultivate AHCI capability.
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