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If I enable to turn off hard disk when inactive in Windows Power Plan - Advanced Settings, will it also stop my downloads in different programs? Currently my Internet connection is slow.
No. When any program (download or not) requests disk access, the disk is no longer inactive, therefore Windows wakes up the disk.
Functionally, this setting is useless when the computer only has one hard drive. Windows will not spin down the OS drive unless the whole machine is going to sleep.