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This is not true..not sure where you found this information. ASM doesn't create partitions...it just creates Disk Groups using the underlying partitions. Not sure, if you are referring to the 1MB extent sizes...
In several places I noticed that 1 GB partitions are created as part of ASM install.
>>>> So my question is are 1 gb partitions simply preference or a standard?
I would say it is simply a preference... and definitely it is not a standard. May be the cases where you have seen - the individuals might be limited by the available space, space usage (..may be they just wanted 1GB of space)... It all boils down to the availability of space and its needs. I have seen where people have two LUNs of 500GB for each Disk Group.
Remember you are probably seeing this in the various install guides that are available. They are a good indication of how to install RAC/ASM but as far as disks go for ASM you need to think about how much data you will have ;-)
The best practice is that you should give whole LUN's (a full partition inside a Windows extended partition) to ASM. And that disks that make up a disk group should be of the same size and have the same performance profile. More than 1 disk per diskgroup.