Can't connect to external HD from sleep

I have an external hd (250 gig Western Digital) attached to my Airport Extreme. After I close my macbook and open it (put it to sleep, basically) it says I connection failed, can no longer connect to server. It works again after I restart my Macbook, but I obviously don't want to do this every time. Does anyone have any solutions?

Don't confuse the amount of memory in the computer RAM with memory on the hard drive, even through both are called memory and measured in bytes. You can check your amount of RAM by looking at About This Mac under the Apple menu. You can find the right type of RAM using the configuration tool on the Crucial website (they have an excellent warranty and reputation for supporting what they sell, so I'd suggest buying from them). You can install RAM yourself following the instructions at eMac - Do-It-Yourself. Installing RAM is a user-servicable item and does not affect your warranty.
The amount of memory on the internal hard drive can be found in Disk Utility, or do Get-Info on the Macintosh HD icon on the Desktop. If your drive has less than 5 GB or so free space, you can easily add an external powered Firewire HD from a vendor such as Small Dog Electronics, and move user data over to the external drive:
iTunes: Moving your iTunes Music folder
iPhoto: How to move the iPhoto Library Folder
You can use Disk Utility to partition an external HD into a partition that matches your internal HD size and one or more other partitions to hold user data, then use CarbonCopyCloner or SuperDuper! to make a bootable clone of the internal HD on the first partition of the external HD. You can also install DiskWarrior on the external HD. Then in an emergency you can boot from the external HD using Startup Manager and either run DW on the internal HD or use SuperDuper! to restore the internal HD from the external backup.

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