Epson QX-10, CP/M

I have a customer (Yes, Virginia, I have two customers) who has an Epson QX-10 running CP/M. His (external) hard disk is reporting bad sectors; he wishes to switch to an ST-506/412 Vertex 185, which I think is 20 MB. I would like to test the Vertex 185 under Spinrite (MS-DOS) and expand the bad track table, if Spinrite discovers more problems. I have questions -- Will the bad track information carry over under CP/M, and will its format utility see the MS-DOS info? Otherwise, should we just make a list and enter it? Is there a low-level format utility in CP/M? Is it necessary, as under MS-DOS? What is the QX-10 controller card going to think of a different hard drive? Will it try to run the new drive as a 10 MB? Thanks, manney(a)lrbcg.com