diff --git b/grub-core/disk/i386/pc/biosdisk.c a/grub-core/disk/i386/pc/biosdisk.c
index f0aadd1..7ca89e3 100644
--- b/grub-core/disk/i386/pc/biosdisk.c
+++ a/grub-core/disk/i386/pc/biosdisk.c
@@ -570,6 +547,10 @@ get_safe_sectors (grub_disk_t disk, grub_disk_addr_t sector)
 
   size = sectors - offset;
 
+  /* Limit the max to 0x7f because of Phoenix EDD.  */
+  if (size > ((0x7fU << GRUB_DISK_SECTOR_BITS) >> disk->log_sector_size))
+    size = ((0x7fU << GRUB_DISK_SECTOR_BITS) >> disk->log_sector_size);
+
   return size;
 }