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Helpful answers
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Aug 8, 2015 6:11 PM in response to roundthehornby a brody,★HelpfulAlas not all USB storage devices respond to this, but there is a checkbox in Apple menu -> System preferences -> Energy Saver for it to prevent from happening. http://www.macsales.com/ can probably sell you a hard drive that doesn't disconnect upon sleep.
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Aug 8, 2015 6:54 PM in response to a brodyby roundthehorn,Thanks for your prompt reply. I did not see a check box in energy saver for this but I will try some different USB drives. Thanks for your advice.
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Aug 9, 2015 12:59 PM in response to roundthehornby K Shaffer,★HelpfulYou could try & see if by using a card reader and a self-powered USB hub, if the
card would remain visible to the computer in that situation. The power interruption
to the USB bus in the computer may be sufficient enough to affect the card.
While I use card readers on occasion, mostly for camera images when I don't want
to attach the camera to a computer (and don't use native OS X photo application)
these are not left attached when the computer is powered off or let go asleep. I use
them and then unmount the card (by eject menu option or drag icon to trash.)
At some point, if the card becomes invisible to the computer due to improper use
or accidental disconnect without correct unmount procedure, you may have to see
if the Disk Utility may be able to attempt a repair. This may include reformat. But
note, that several cameras or devices that rely on the card to have a specific format
would need to then reformat it again before it would be useful to said device.
And you may need to finally replace the USB storage flash memory or other, should
it continue or get worse in this regard. Some issues represent defective hardware.
Good luck!
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Aug 19, 2015 12:22 AM in response to roundthehornby Ronda Wilson,The easiest answer is don't let it sleep; leave it open and set it in System Preferences for the hard drive to never sleep.
You can set the display to sleep without sleeping the computer.