What is Reddit's opinion of UpBright Mini 5-Pin AC/DC Adapter Compatible with iomega UP01842010 30590000 04115801 3059000 DHD160-U Zip HDD DA-30C03 30941702 30941701 DA-30C01 APD Liteon PA-2150-1 02426901 10185 GPC14-2001 5V 12V?

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What you have there is a so-called mini-DIN plug (for "Deutsches Institut für Normung", a German standards body) that offers 5V and 12V.

It is probably the same as this, but without detailed information on the HD enclosure, I can't say for sure whether the pinout on the connector is what you need.

My recommendation would be to skip the enclosure entirely. Remove the hard disk and attach it to something like this, a dedicated USB-to-IDE device that comes with the right power adapter. Better to spend $20 on a useful general-purpose device than $20 on a power adapter that may or may not work correctly.

Finally, I note that the drive is marked for USB and Firewire. Was it used for a Mac? If so, you may need to hook it back up to a Mac to get the data off of it, since a Windows PC won't be able to read a Mac filesystem.