diff --git a/pym/install/variables/autopartition.py b/pym/install/variables/autopartition.py
index 2133281..6956cf0 100644
--- a/pym/install/variables/autopartition.py
+++ b/pym/install/variables/autopartition.py
@@ -23,7 +23,7 @@ import calculate.lib.utils.device as device
 from calculate.lib.utils.device import humanreadableSize
 from calculate.lib.utils import partition
 from calculate.lib.utils.files import (readLinesFile)
-from calculate.lib.utils.mount import isMount
+from calculate.lib.utils.mount import isMount, try_umount
 from calculate.install.fs_manager import FileSystemManager
 from calculate.lib.utils.tools import Sizes, traverse
 from itertools import *
@@ -295,6 +295,24 @@ class VariableClAutopartitionDevice(AutopartitionHelper, Variable):
                 if typecheck.search(fulltype):
                     raise VariableError(_("RAID %s is wrong") % dev)
 
+    def is_force_param(self):
+        return "--force" in self.Get("cl_console_args")
+
+    def get_mounted_devices(self):
+        mountedData = [(x,y) for x,y in self.ZipVars(
+            "os_disk_parent", "os_disk_dev") if isMount(y)]
+        mountedDevices = {}
+        for devices, disk  in mountedData:
+            if not isMount(disk):
+                continue
+            if self.is_force_param() and try_umount(disk):
+                continue
+            for _device in traverse(devices.split(',')):
+                if _device not in mountedDevices:
+                    mountedDevices[_device] = set()
+                mountedDevices[_device].add(disk)
+        return mountedDevices
+
     def check(self, valuelist):
         if self.Get('cl_autopartition_set') == "on":
             if not valuelist:
@@ -303,14 +321,8 @@ class VariableClAutopartitionDevice(AutopartitionHelper, Variable):
 
             useDisks = set(traverse(x.split(',') for x in self.Select(
                     'os_disk_parent', where='os_disk_mount', ne='')))
-            mountedData = [(x,y) for x,y in self.ZipVars(
-                "os_disk_parent", "os_disk_dev") if isMount(y)]
-            mountedDevices = {}
-            for devices, disk  in mountedData:
-                for _device in traverse(devices.split(',')):
-                    if _device not in mountedDevices:
-                        mountedDevices[_device] = set()
-                    mountedDevices[_device].add(disk)
+
+            mountedDevices = self.get_mounted_devices()
 
             for value in chain(valuelist):
                 for disk in set(chain(self.select(
diff --git a/pym/install/variables/disk.py b/pym/install/variables/disk.py
index 04f4a68..18fcb06 100644
--- a/pym/install/variables/disk.py
+++ b/pym/install/variables/disk.py
@@ -35,7 +35,7 @@ from calculate.lib.utils.device import (getPartitionSize,
 from calculate.install.variables.autopartition import Sizes
 from calculate.lib.utils.files import getProgPath
 from calculate.lib.utils.mount import isMount, FStab, DiskSpace, Btrfs, \
-    BtrfsError
+    BtrfsError, try_umount
 from calculate.install.fs_manager import FileSystemManager
 
 from calculate.lib.cl_lang import setLocalTranslate, _
@@ -1418,6 +1418,9 @@ class VariableOsLocationPerformFormat(LocationHelper, Variable):
 
     fixNtfs = lambda self, x: {'ntfs-3g': 'ntfs'}.get(x, x)
 
+    def is_force_param(self):
+        return "--force" in self.Get("cl_console_args")
+
     def check(self, value):
         """Check perform format
 
@@ -1453,9 +1456,10 @@ class VariableOsLocationPerformFormat(LocationHelper, Variable):
                           "mounted to {mountpoint} on the current system").format(
                             device=dev, mountpoint=diskMount.get(dev, '')))
                 if isMount(dev):
-                    raise VariableError(
-                        _("Please unmount {device}, as it will be used for "
-                          "installation").format(device=dev))
+                    if not self.is_force_param() or not try_umount(dev):
+                        raise VariableError(
+                            _("Please unmount {device}, as it will be used for "
+                              "installation").format(device=dev))
                 # but user select non-format
                 if not self.isTrue(isformat):
                     raise VariableError(
@@ -1479,9 +1483,10 @@ class VariableOsLocationPerformFormat(LocationHelper, Variable):
                         ).format(
                             device=dev, mountpoint=diskMount.get(dev, '')))
                 elif isMount(dev):
-                    raise VariableError(
-                        _("Please unmount disk {device} to "
-                          "use it for install").format(device=dev))
+                    if not self.is_force_param() or not try_umount(dev):
+                        raise VariableError(
+                            _("Please unmount disk {device} to "
+                              "use it for install").format(device=dev))
 
     def defaultPerformFormat(self):
         diskFormat = dict(zip(self.Get('os_disk_dev'),
@@ -2036,6 +2041,9 @@ class VariableOsInstallUefi(LocationHelper, Variable):
     def install_to_flash(self):
         return self.Get('os_install_root_type') == 'flash'
 
+    def is_force_param(self):
+        return "--force" in self.Get("cl_console_args")
+
     def get(self):
         # если используется авторазметка список разделов находится в ней
         if self.GetBool('cl_autopartition_set'):
@@ -2117,9 +2125,11 @@ class VariableOsInstallUefi(LocationHelper, Variable):
                                       os_disk_format__ne="vfat")
             for efipart in value:
                 if efipart in not_fat_efi and isMount(efipart):
-                    raise VariableError(
-                        _("Please unmount {device}, as it will be used for "
-                          "installation").format(device=efipart))
+
+                    if not self.is_force_param() or not try_umount(efipart):
+                        raise VariableError(
+                            _("Please unmount {device}, as it will be used for "
+                              "installation").format(device=efipart))
 
             for efipart in value:
                 if efipart in self.select('os_location_source',