Second HDD disappears

I have a 3 year old HP Pavillion and added a new HDD. I bought the enclosure and added the SATA drive no problem, but every once and a while when the laptop is on say over night it disappears. I reboot and it is back again. Is the a filter like when a CD/DVD is lost or does anyone know what is up. Why does it seem to disappear?
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More about second disappears
  1. It may be having problems waking from sleep mode. You can try adjusting your power settings and tell it not to let your drives go to sleep.
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