diff --git a/ChangeLog b/ChangeLog
index 71c33569f..2eb0c0fcd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2011-07-23  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* grub-core/disk/pata.c (grub_pata_readwrite): Add missing wait.
+
 2011-07-23  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* include/grub/video.h: add missing EXPORT_FUND on
diff --git a/grub-core/disk/pata.c b/grub-core/disk/pata.c
index ff6f77366..c54fe91ab 100644
--- a/grub-core/disk/pata.c
+++ b/grub-core/disk/pata.c
@@ -177,6 +177,10 @@ grub_pata_readwrite (struct grub_ata *disk,
   /* Start command. */
   grub_pata_regset (dev, GRUB_ATA_REG_CMD, parms->taskfile.cmd);
 
+  /* Wait for !BSY.  */
+  if (grub_pata_wait_not_busy (dev, GRUB_ATA_TOUT_DATA))
+    return grub_errno;
+
   /* Check status.  */
   grub_int8_t sts = grub_pata_regget (dev, GRUB_ATA_REG_STATUS);
   grub_dprintf ("pata", "status=0x%x\n", sts);