Does HDD in Sleep mode under Windows 8 still spins - as it's saves your RAM into HDD? I'm concerned about hdd when carrying laptop around in a bag when it's in sleep mode. Or it is Hibernate which turns off my hdd - as it's saves all into RAM?
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S1 - CPU Stopped: The power consumption is reduced by a fraction (Five Watts to Thirty Watts of Power). This state is used in computers without S3.
S3 - Sleep (Suspend to RAM): the PC is in a standby state and all the devices (hdd, fans, optical drive) are powered down.
S4 - Hibernate: everything on the RAM (data) is saved on HDD. It still drains some battery, but even less than S3.
You can find brief explanations about the sleep, hibernate and (new) hybrid sleep states at Microsoft here.