Those WD20EARS emulate 512 bytes sectors, so yes you can freely mix and match 
them with other "regular" 512 bytes drives. Some have reported slower 
read/write speeds but nothing catastrophic.

Or you can create a new 4K aligned pool (composed of only 4K drives!) to really 
take advantage of them. For that, you will need a modified zpool command to 
sets the ashift value of the pool to 12.

See here: 

http://digitaldj.net/2010/11/03/zfs-zpool-v28-openindiana-b147-4k-drives-and-you/
http://www.solarismen.de/archives/5-Solaris-and-the-new-4K-Sector-Disks-e.g.-WDxxEARS-Part-2.html
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