S1/S3 POS and STR?

[HammerBot]

My BIOS (Main system) has some ACPI suspend type options: S1(POS), S3(STR) and S1&S3. What's the difference and how is it supposed to affect system standby, hibernation etc. I tried the various setting and can't seem to spot any difference.
The system runs Windows XP.

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[mbetea]

lets see if i remember correclty. there are a total of 6 power states:

1. s0: fully powered on.
2. s1: shuts everything off except for cpu, ram, hdd and the mobo, but keeps a low level of power to these devices to maintain sys info.
3. s2: ram is powered, cpu is powered but not running, sys info written to ram.
4. s3(suspend to ram-STR): shuts off everything except ram, writing all sys info to ram.
5. s4(hibernate): writes all sys info to hdd then shuts the computer down completely.
6. s5: complete shutdown, no info saved.

i believe these are all correct. if not i'm sure someone else will let us know. they all perform the same task, the differences are power consumption and how quickly is the system to recover.

cdrw, floppy drive, cd-rom? what are these strange words you speak of?