Should I let the External HDD in sleep mode or not

Dear all,

As the title, please explain to me that should I let the external HDD in sleep mode after 90mins for instance or just let it run all the time. which is better for hdd lifetime?

I have 2TB Essential and 2TB Mybook external HDD just for backup and video storage, sometimes I don’t need to access them for a long time.

Thank you.

If you don’t need to access it for a long time it is better to let it sleep. 

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