syslog
Sep 24 20:44:21 DLNQNT kernel: ata2.00: ATA-9: WDC WD100EMAZ-00WJTA0, JEGKNTAN, 83.H0A83, max UDMA/133
...
Sep 24 20:44:21 DLNQNT kernel: ata3.00: ATA-9: WDC WD100EMAZ-00WJTA0, 1EG8SH2Z, 83.H0A83, max UDMA/133
There were some reassignments and you can see all this in syslog, but that is the slots those serials ended up being assigned according to smart folder in diagnostics.