Sorry if the question has been discussed before...did a pretty extensive 
search, but no luck...

Preparing to build my first raidz pool. Plan to use 4 identical drives in a 3+1 
configuration.

My question is -- what happens if one drive dies, and when I replace it, design 
has changed slightly and the drive is (very slightly) different sized. Still a 
1TB or what have you, but not identical. I'm guessing if it is slightly larger, 
no problem, slightly smaller is trouble, but that isn't always obvious when you 
buy a drive. My concern is that in a year when the drive blows, XYZ brand's 
model 1000 will be replaced by XYZ model 1001 that formats to 1MB less (or 
worse, I need to replace an XYZ brand 1TB with a similar 1TB ABC brand)

Is there a best practices suggestion here? Is this a real problem? Can I force 
format the drives very slightly less than full capacity before adding them to 
the pool to prevent such an issue?

Thanks.
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