Performing a retry (with the master/slave order reversed from my prior attempt), I'm getting this occasionally which is different from before:

/drive0/fids/b2e1 -> /drive1/fids/b2e1
/drive0/fids/b2f0 -> /drive1/fids/b2f0
/drive0/fids/b2f1 -> /drive1/fids/b2f1
/drive0/fids/b300 -> /drive1/fids/b300
/drive0/fids/b301 -> /drive1/fids/b301
/drive0/fids/b310 -> /drive1/fids/b310
hdb: status timeout: status=0xd0
hdb: no DRQ after issuing WRITE
ide0: reset: success
/drive0/fids/b311 -> /drive1/fids/b311
/drive0/fids/b320 -> /drive1/fids/b320
/drive0/fids/b321 -> /drive1/fids/b321
/drive0/fids/b330 -> /drive1/fids/b330
/drive0/fids/b331 -> /drive1/fids/b331
/drive0/fids/b340 -> /drive1/fids/b340
/drive0/fids/b301 -> /drive1/fids/b301
/drive0/fids/b310 -> /drive1/fids/b310
hdb: status timeout: status=0xd0
hdb: no DRQ after issuing WRITE
ttyS1: 1 input overrun(s)
ide0: reset:uccess
/drive0/fids/b311 -> /drive1/fids/b311
/drive0/fids/b320 -> /drive1/fids/b320
/drive0/fids/b321 -> /drive1/fids/b321
/drive0/fids/b341 -> /drive1/fids/b341
/drive0/fids/b350 -> /drive1/fids/b350