=== modified file 'disk/ieee1275/ofdisk.c'
--- disk/ieee1275/ofdisk.c	2010-07-28 07:55:56 +0000
+++ disk/ieee1275/ofdisk.c	2010-07-29 03:58:16 +0000
@@ -264,7 +264,7 @@
       
     }
 
-    if (size > 1024)
+    if (curr > 1024 && size == 512)
       disk->total_sectors = curr / 512;
     op->size = disk->total_sectors;
   }
@@ -303,13 +303,13 @@
 		      pos, &status);
   if (status < 0)
     return grub_error (GRUB_ERR_READ_ERROR,
-		       "seek error, can't seek block %llu",
-		       (long long) sector);
+		       "seek error, can't seek on '%s' at block %llu",
+		       disk->name, (long long) sector);
   grub_ieee1275_read ((grub_ieee1275_ihandle_t) (unsigned long) disk->data,
 		      buf, size * 512UL, &actual);
   if (actual != (grub_ssize_t) (size * 512UL))
-    return grub_error (GRUB_ERR_READ_ERROR, "read error on block: %llu",
-		       (long long) sector);
+    return grub_error (GRUB_ERR_READ_ERROR, "read error on '%s' at block: %llu",
+		       disk->name, (long long) sector);
 
   return 0;
 }