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Installing Win7 on a HDD setup for IDE mode in AHCI mode

V

videobruce

Golden Member
I'm not sure where to put this, but here it is.

Using a already formatted & partitioned HDD from a older non GPT ready (if you will) MB, I want to install Win7 64 bit using AHCI. The current O/S on that active partition is XP which I want to replace.
The other partitions (two) have data on them that I don't want to loose. (I do have it backed up).

What happens to the drive when I install Win7 in AHCI mode to the other non active partitions?
 
A 2nd question; with a SSD drive that I have installed Win7 on (fresh install), for kicks & giggles, I switched back to IDE mode and booted back into Windows. To mu partial surprise, there was no difference unlike the other way around where you get greeted with a BSOD.

With that SSD, if I leave the SATA mode to IDE, what is the disadvantage?
 
IDE - no NCQ, random I/O would suffer. Not sure if IDE is actually limited speed wise as well.
Windows 7 has most of IDE/AHCI controllers drivers already in, so it won't BSOD like XP when you switch IDE to AHCI.
for first question, AHCI or IDE, won't change whats on the disk
 
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