diff --git a/drivers/ata.c b/drivers/ata.c
index 8ac576f..5476e91 100644
--- a/drivers/ata.c
+++ b/drivers/ata.c
@@ -418,6 +418,10 @@ int ATADetectDevice(struct ata_device *dev)
 	struct ata_controller *ctl = dev->ctl;
 	outb(ctl->base + ATA_PIO_DRIVE,
 	     ATA_PIO_DRIVE_IBM | (dev->isSlave ? ATA_PIO_DRIVE_SLAVE : ATA_PIO_DRIVE_MASTER));
+	outb(ctl->base + ATA_PIO_SEC_COUNT, 0);
+	outb(ctl->base + ATA_PIO_LBALO, 0);
+	outb(ctl->base + ATA_PIO_LBAMID, 0);
+	outb(ctl->base + ATA_PIO_LBAHI, 0);
 	unsigned st = inb(ctl->base + ATA_PIO_STATUS);
 	if (st & ATA_PIO_STATUS_DRIVE_BUSY)
 		goto no_disk;