Zero Out All Data and GUID

I'm just formatting a second hard drive for backup purposes. I've decided I want to zero out all data to ensure that the drive maps out bad blocks, and then I'm going to create a GUID partition just in case I decide to make it a boot drive in future.
Three questions:
Why doesn't Disk Utility give you the option of Zero Out All Data and GUID partition as a 'one stop shop'?
Is there any disadvantage to having a GUID partition on a backup drive?
Are any remapped bad blocks found during the zeroing process retained after the GUID partition erase?

Zeroing and GUID don't always go together. AIUI, GUID is only compulsory for a boot partition for Intel Macs; and it is recommended for volumes used by Time Machine. Otherwise, Apple Partition Map will usually be required since it can be read by both Intel and PowerPC Macs.
The disadvantage to having a GUID partition is that it won't be readable by PowerPC Macs.
Simon

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