diff --git a/src/hw/ata.c b/src/hw/ata.c
index d805706..84e747d 100644
--- a/src/hw/ata.c
+++ b/src/hw/ata.c
@@ -739,7 +739,8 @@ init_drive_atapi(struct atadrive_s *dummy, u16 *buffer)
     u8 iscd = ((buffer[0] >> 8) & 0x1f) == 0x05;
     char model[MAXMODEL+1];
     char *desc = znprintf(MAXDESCSIZE
-                          , "DVD/CD [ata%d-%d: %s ATAPI-%d %s]"
+                          , "ATA@%04x:%u-%u: %s ATAPI-%d %s"
+                          , adrive->chan_gf->pci_bdf
                           , adrive->chan_gf->chanid, adrive->slave
                           , ata_extract_model(model, MAXMODEL, buffer)
                           , ata_extract_version(buffer)
@@ -791,7 +792,8 @@ init_drive_ata(struct atadrive_s *dummy, u16 *buffer)
     }
     char model[MAXMODEL+1];
     char *desc = znprintf(MAXDESCSIZE
-                          , "ata%d-%d: %s ATA-%d Hard-Disk (%u %ciBytes)"
+                          , "ATA@%04x:%u-%u: %s ATA-%d Hard-Disk (%u %ciBytes)"
+                          , adrive->chan_gf->pci_bdf
                           , adrive->chan_gf->chanid, adrive->slave
                           , ata_extract_model(model, MAXMODEL, buffer)
                           , ata_extract_version(buffer)
@@ -865,8 +867,8 @@ ata_detect(void *data)
         outb(0xaa, iobase1+ATA_CB_SN);
         u8 sc = inb(iobase1+ATA_CB_SC);
         u8 sn = inb(iobase1+ATA_CB_SN);
-        dprintf(6, "ata_detect ata%d-%d: sc=%x sn=%x dh=%x\n"
-                , chan_gf->chanid, slave, sc, sn, dh);
+        dprintf(6, "ata_detect ATA@%04x:%u-%u: sc=%x sn=%x dh=%x\n"
+                , chan_gf->pci_bdf, chan_gf->chanid, slave, sc, sn, dh);
         if (sc != 0x55 || sn != 0xaa || dh != newdh)
             continue;
 
@@ -913,24 +915,23 @@ ata_detect(void *data)
 
 // Initialize an ata controller and detect its drives.
 static void
-init_controller(struct pci_device *pci, int irq
+init_controller(struct pci_device *pci, int irq, u32 chan
                 , u32 port1, u32 port2, u32 master)
 {
-    static int chanid = 0;
     struct ata_channel_s *chan_gf = malloc_fseg(sizeof(*chan_gf));
     if (!chan_gf) {
         warn_noalloc();
         return;
     }
-    chan_gf->chanid = chanid++;
+    chan_gf->chanid = chan;
     chan_gf->irq = irq;
     chan_gf->pci_bdf = pci ? pci->bdf : -1;
     chan_gf->pci_tmp = pci;
     chan_gf->iobase1 = port1;
     chan_gf->iobase2 = port2;
     chan_gf->iomaster = master;
-    dprintf(1, "ATA controller %d at %x/%x/%x (irq %d dev %x)\n"
-            , chanid, port1, port2, master, irq, chan_gf->pci_bdf);
+    dprintf(1, "ATA controller ATA@%04x:%u (io %x/%x/%x irq %d)\n"
+            , chan_gf->pci_bdf, chan, port1, port2, master, irq);
     run_thread(ata_detect, chan_gf);
 }
 
@@ -966,7 +967,7 @@ init_pciata(struct pci_device *pci, u8 prog_if)
         port2 = PORT_ATA1_CTRL_BASE;
         irq = IRQ_ATA1;
     }
-    init_controller(pci, irq, port1, port2, master);
+    init_controller(pci, irq, 0, port1, port2, master);
 
     if (prog_if & 4) {
         port1 = (pci_config_readl(bdf, PCI_BASE_ADDRESS_2)
@@ -979,7 +980,7 @@ init_pciata(struct pci_device *pci, u8 prog_if)
         port2 = PORT_ATA2_CTRL_BASE;
         irq = IRQ_ATA2;
     }
-    init_controller(pci, irq, port1, port2, master ? master + 8 : 0);
+    init_controller(pci, irq, 1, port1, port2, master ? master + 8 : 0);
 }
 
 static void
@@ -1011,9 +1012,9 @@ ata_scan(void)
     if (CONFIG_QEMU && hlist_empty(&PCIDevices)) {
         // No PCI devices found - probably a QEMU "-M isapc" machine.
         // Try using ISA ports for ATA controllers.
-        init_controller(NULL, IRQ_ATA1
+        init_controller(NULL, IRQ_ATA1, 0
                         , PORT_ATA1_CMD_BASE, PORT_ATA1_CTRL_BASE, 0);
-        init_controller(NULL, IRQ_ATA2
+        init_controller(NULL, IRQ_ATA2, 1
                         , PORT_ATA2_CMD_BASE, PORT_ATA2_CTRL_BASE, 0);
         return;
     }