diff --git a/install/variables/disk.py b/install/variables/disk.py
index 97cb014..ef0f9e2 100644
--- a/install/variables/disk.py
+++ b/install/variables/disk.py
@@ -29,6 +29,7 @@ from calculate.lib.utils.device import (getUdevDeviceInfo,getDeviceType,
                         getPartitionType,getPartitionDevice,getRaidPartitions,
                         getLvmPartitions,getPartitionSize, humanreadableSize,
                         getUUIDDict,getCommonDeviceName)
+from calculate.install.variables.autopartition import Sizes
 from calculate.lib.utils.files import (listDirectory,pathJoin,readFile,FStab,
                                        isMount)
 from calculate.install.distr import PartitionDistributive
@@ -1682,6 +1683,10 @@ class VariableOsInstallMbr(LocationHelper,Variable):
                     _("For Flash install, you need only one disk"))
         if self.Get('os_install_uefi_set') == 'on':
             return
+        useBtrfs = "btrfs" in self.Select('os_install_disk_format',
+                                    where='os_install_disk_mount',
+                                    _in=('/','/boot'),
+                                    sort="DESC")[:1]
         for mbrDisk in value:
             if self.Get('cl_autopartition_set') == 'on':
                 tableOnBootDisk = self.Get('cl_autopartition_table')
@@ -1696,12 +1701,27 @@ class VariableOsInstallMbr(LocationHelper,Variable):
                 if tableOnBootDisk == "gpt":
                     raise VariableError(_("You need a disk with a dos "
                                           "table for Flash install"))
+            if tableOnBootDisk == "dos" and useBtrfs:
+                raise VariableError(_("You need a disk with a gpt "
+                                          "table for install on btrfs"))
             if rootType in ("usb-hdd","hdd") and tableOnBootDisk == "gpt":
-                bios_grub = self.Select('os_disk_parent',
-                                        where='os_disk_id',eq='EF02')
-                if not mbrDisk in bios_grub:
+                efisize = self.Select('os_disk_size',
+                           where=['os_disk_id','os_disk_parent'],
+                           func=lambda os_disk_id,os_disk_parent:(
+                           os_disk_id == 'EF02' and os_disk_parent == mbrDisk),
+                           limit=1)
+                if not efisize:
                     raise VariableError(
                         _("Disk %s must have a 'bios_grub' partition")%mbrDisk)
+                # проверка размера EF02 при установке на btrfs
+                elif useBtrfs:
+                    bios_grub_size = self.Get('cl_autopartition_bios_grub_size')
+                    if (efisize.isdigit() and bios_grub_size.isdigit() and 
+                        int(efisize) < int(bios_grub_size)):
+                        raise VariableError(
+                            _("Disk {diskname} must have a 'bios_grub' "
+                            "partition with size at least {size}Mb").format(
+                            diskname=mbrDisk,size=int(bios_grub_size)/Sizes.M))
         if value:
             if self.Get('os_grub2_path'):
                 self.checkForGrub2()
@@ -1709,12 +1729,14 @@ class VariableOsInstallMbr(LocationHelper,Variable):
                 self.checkForLegacyGrub()
 
     def checkForGrub2(self):
-        """Check current disk configuration for installation for install
-        GRUB2"""
+        """
+        Проверить текущую конфигурацию диска для установки GRUB2
+        """
         grubDiskType=self.Select('os_install_disk_parent',
                                  where='os_install_disk_mount',
                                  _in=('/','/boot'),
                                  sort="DESC",limit=1)
+
         if "lvm-raid" in grubDiskType:
             raise VariableError(
               _("Grub does not support booting from a RAID assembled from a LVM")