Blocked vs Locked. I don't think your issue is SED.
did some quick google fu this morning:
At a quick guess, (and I may be wrong):
you have two drives that are configured for 512e sector and two that are configured for 4kn.
Check the drive labels carefully.
There is a variant of this drive that is only 4kn... there's an extra 4. See here
. (PDF download). However you said these drives are all SAS and the 4kn only is SATA - but seller may have not correctly identified the drive too. The provenance of the drives is also probably different even though they came from the same seller, the two blocked drives were likely used in an enterprise storage appliance or server that supported 4kn sectors.
SATA version with 4Kn only ST14000NM0448 <--- If you have this one I'd recommend returning the two blocked drives to the seller.
SAS version with 512e/4kn ST14000NM0048 <--- should be able to make it work.
I found this Dell Community forum thread
useful. Basically the H310 doesn't support 4kn sector size.
There's also a bunch of information regarding Dell's decision to block 3rd party drives but I see no reference that the H310 does this and lots of references that the H7xx and H8xx will block non dell drives. I don't think 3rd party drive blocking is at issue.
If all 4 of your drives are the same model and then you may be able to reformat the two that are blocked.
I suspect though as I mentioned in my first reply you will have to either reflash your H310 to IT mode to try and reformat the drive or buy/beg/borrow/steal an HBA in IT mode to reformat. If the problem is 4kn format then you should be able to get the two misbehaving drives reformatted you are probably golden.
There is an absolute treasure trove of information at STH about cross flashing LSI controller variants and the PERC H310 is an excellent one as well as reformatting drives (--six will be your friend).
You should be able to cross flash back from IT mode to R mode whether using the stock DELL firmware or the LSI firmware since you want to use R mode under ESXI.
If you are concerned with potentially messing up your current HBA you could pick up one off eBay ($20?) and flash that one keeping your current HBA pristine or you can spend a bit more and get one
already flashed to IT mode with support from the seller.
I think the paths you take will depend on how much you want to learn/figure out and whether you will enjoy the process or you just want it "done".
I'm very interested in what drives you have. Will you please post back with your findings?