Can't Access My External Drive

My external drive was setup to allow access under my account name. I will be getting a new mac soon. I wanted to be able to use the external drive on the new mac. I accessed the external drive and set the permission to "system" to allow universal access. Somehow I managed to mess up permissions or something and I can no longer get access to the drive. I can see the drive using the disk utility but repairing the drive is grayed out. Not sure what to do? Help.

Hi Dansyacht, and a warm welcome to the forums!
Open Terminal & paste this in, spaces are important...
chmod 777 /Volumes/
then right after the last /, carefully type the name of that external volume, & if it has spaces in it enclose the name in quote marks.

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