Disk drive types: 59C9, 59E1, 5B13

Like it or not, I'm becoming more familiar with our hardware and I'm finding some things that I consider anomalies.  Case in point is my DSPHDWRSC display.  It turns out we have a combination of SSD and spinny drives on the production partition.  I'm just learning the ramifications of that (including the fact that CHGPF has a UNIT(*SSD) keyword!), but in so doing I decided to look at DSPHDWRSC on the development partition.

It seems like we have only spinny drives on the development partition, which is as it should be.  However, it turns out on that partition we have cases where the same slot (I'm guessing) has two disk drives defined (I think), one of which is available in that partition and one of which is not (I assume).  Yeah, I'm very, very confident of this information.  It looks like this:

Resource  Type-model  Status        Text
DMP001     59C9-050   Not detected  Disk Unit
DMP073     59C9-099   Operational   Disk Unit

They're both in location U5887.001.G78J00V-P1-D2.  I have no idea what the -050 or -099 suffix means.  But doing a little more research, it turns out the resources that are flagged as not detected show up in DSPHDWRSC on the production partition as Operational.  That is, DMP001 is Not detected on the development partition but Operational on the production partition.  The reverse is not true.  Resources that are Operational on development (such as DMP073) do not show up at all on the production partition in DSPHDWRSC.  So which is "normal"?

The resource number could be a red herring, though.  Although DMP001 shows on both partitions, DMP001 on development has a different serial number than DMP001 on production.  My head hurts.

There's one more thing that bothers me.  Knowledge center tells me a 59C9 is a 300GB 15K 4K-block SAS drive, but that it's an AIX/Linux drive, not an IBM i drive.  As far as I can tell, the IBM i equivalent is the 59E1, which is a 283GB drive.  The main box is all 59C9 (and 5B13 SSD).  We also have a remote CBU box with a mixture of 59E1 and 59C9.  Is it normal to use the 300GB drive on an i partition?  Enquiring minds want to know...