External hard drive preventing windows sleep

[Scottland]

Hi,

I've got an external USB hard drive (powered) which when plugged into USB stops the computer from sleeping - and if I manually put the computer to sleep then it wakes immediately.

I've got another USB drive (USB powered) which doesn't exhibit this problem. If I disable USB waking in the BIOS, then no issue.


In the windows device settings for the hard drive, there's no option to uncheck 'allow device to wake computer'.


Also - I've got a Windows 8.1 and Win 10 builds on seperate partitions - both have the exact same issue.


Any ideas?

 

[Scottland]

Done some further testing and it seems to only be an issue with the drive plugged into as USB3 port. However it is still an issue on a different computer so must be a drive issue?