Do I need to uncheck 'Put hard drives to sleep...' if I'm copying files to ext. HDD?

[DobaKung]

Hi,

I'm in the need to get outside of my home for a couple of hours. I let my Mac transfers files from SDHC to ext. HDD, so that when I come back home, it will finish its job. My question is, do I need to uncheck the Put hard drives to sleep when possible ? Because my computer is just like a bridge that lets files from SDHC transfer to ext. HDD, am I correct? So do I need to uncheck it to make the job finished without interruption?

Thanks for every reply.

 

[adnbek]

No. The "when possible" means when the disk is idling. If it's being accessed in anyway way, it won't go to sleep.

 

[Mr. Retrofire]

No. The "when possible" means when the disk is idling. If it's being accessed in anyway way, it won't go to sleep.

Correct. All Apple drivers, such as USB and Thunderbolt drivers support certain power management features. They tell the OS, that the drive is not idle.

 

[DobaKung]

No. The "when possible" means when the disk is idling. If it's being accessed in anyway way, it won't go to sleep.

Correct. All Apple drivers, such as USB and Thunderbolt drivers support certain power management features. They tell the OS, that the drive is not idle.

Thanks to all of you