:: commit 51fc81b117ff08e9542d1a850cb702050678606f

diff --git a/common/drivers/disk.s2.c b/common/drivers/disk.s2.c
index 31709d06..6678f7f8 100644
--- a/common/drivers/disk.s2.c
+++ b/common/drivers/disk.s2.c
@@ -19,10 +19,10 @@
 #define DEFAULT_FASTEST_XFER_SIZE 64
 #define MAX_FASTEST_XFER_SIZE 512
 
-#define MAX_VOLUMES 64
-
 #if defined (BIOS)
 
+#define MAX_VOLUMES 64
+
 struct bios_drive_params {
     uint16_t buf_size;
     uint16_t info_flags;
@@ -307,6 +307,8 @@ void disk_create_index(void) {
 
 #if defined (UEFI)
 
+#define MAX_VOLUMES 256
+
 int disk_read_sectors(struct volume *volume, void *buf, uint64_t block, size_t count) {
     EFI_STATUS status;