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Without kowing it, many users will feel no difference. On the other hand, any SATA disk can work in IDE mode.

That is, if you connect a disk with Windows XP to the system with AHCI-enabled controllers, you will run into a BSOD error (“the blue screen of death”). The matter is that operation of disk controllers in AHCI mode is supported in operating systems beginning with Windows Vista. Many people can ask quite a logical question: why have IDE mode for a SATA disk, if AHCI mode is natural for it enabling this SATA disk to completely realize its potential? Moreover, many motherboard manufacturers supply products with a default option to support PATA compatibility mode – IDE.