diff --git a/app/controllers/disk_wizard_controller.rb b/app/controllers/disk_wizard_controller.rb
index b7ca4bc..e12f158 100644
--- a/app/controllers/disk_wizard_controller.rb
+++ b/app/controllers/disk_wizard_controller.rb
@@ -53,6 +53,10 @@ def manage_disk
     if request.post?
       self.user_selections = {fs_type: fs_type, format: format, path: partition}
     end
+    if partition.match(/^\/dev/).blank?
+      device = Device.find_with_unallocated(user_selections['disk'])
+      @selected_partiton = (device.partitions.select{|part| part.identifier == user_selections['path'] }).first
+    end
   end
 
   # Expected key:values in @params:
@@ -64,7 +68,8 @@ def confirmation
     unless params[:fs_type].blank?
      # create new partition with this file system
      fs_type = params[:fs_type].to_i
-     self.user_selections = {fs_type: fs_type}
+     partition_divider = params[:partition_divider].to_i
+     self.user_selections = {fs_type: fs_type, partition_divider: partition_divider}
     end
     option = params[:option]
     label = params[:label].blank? ? nil : params[:label]
@@ -131,7 +136,8 @@ def process_disk
       end
 
       if option.include?(CREATE_OPTION)
-        para = {identifier: user_selections['identifier'], path: user_selections['disk'], fs_type: user_selections['fs_type']}
+        para = {identifier: user_selections['identifier'], path: user_selections['disk'],
+          fs_type: user_selections['fs_type'], partition_divider: user_selections['partition_divider']}
         job_name = :create_new_partition_job
         DebugLogger.info "|#{self.class.name}|>|#{__method__}|:Job_name = #{job_name}, para = #{para}"
         jobs_queue.enqueue({job_name: job_name, job_para: para})
diff --git a/app/views/disk_wizard/confirmation.html.erb b/app/views/disk_wizard/confirmation.html.erb
index d97a528..3672e26 100644
--- a/app/views/disk_wizard/confirmation.html.erb
+++ b/app/views/disk_wizard/confirmation.html.erb
@@ -63,7 +63,7 @@
                   <span class="badge alert-info"> <span class="glyphicon glyphicon-ok"></span> </span> create Partition
                 </li>
                 <li class="list-group-item text-left">
-                  <span class="badge alert-info"><%= number_to_human_size @selected_disk.size %></span>
+                  <span class="badge alert-info"><%= number_to_human_size @selected_disk.size/user_selections['partition_divider'] %></span>
                   Partition Size
                 </li>
               <% elsif option == DiskWizardController::NOTHING_OPTION %>
diff --git a/app/views/disk_wizard/manage_disk.html.erb b/app/views/disk_wizard/manage_disk.html.erb
index 7af5448..9b5a5cc 100644
--- a/app/views/disk_wizard/manage_disk.html.erb
+++ b/app/views/disk_wizard/manage_disk.html.erb
@@ -24,19 +24,23 @@
   $( document ).ready( function () {
     if ($('.create_new_partition').is(':checked')) {
         $('#fs_selector').slideDown();
+        $('#size_selector').slideDown();
         $('#mount_after_creation').slideDown();
     } else {
         $('#fs_selector').slideUp();
         $('#mount_after_creation').slideUp();
+        $('#size_selector').slideUp();
     }
   });
   $(function () {
     $('.create_new_partition, .nothing').change(function () {
         if ($('.create_new_partition').is(':checked')) {
             $('#fs_selector').slideDown();
+            $('#size_selector').slideDown();
             $('#mount_after_creation').slideDown();
         } else {
             $('#fs_selector').slideUp();
+            $('#size_selector').slideUp();
             $('#mount_after_creation').slideUp();
         }
     });
@@ -90,16 +94,25 @@
                 <div class="alert alert-info">
                   <label > Create new partition</label>
                   <div class="row">
+                    <div id="size_selector" class="col-md-10 col-md-offset-1" style="display: none;">
+                      <ul class="list-group">
+                        <li class="list-group-item list-group-item-info">
+                          Please select a Partition size
+                        </li>
+                        <%= select_tag :partition_divider, options_for_select([
+                          ["#{number_to_human_size @selected_partiton.size}", 1],
+                          ["#{number_to_human_size (@selected_partiton.size/2)}", 2],
+                          ["#{number_to_human_size (@selected_partiton.size/4)}", 4]], 0), class: "form-control" %>
+                      </ul>
+                    </div>
                     <div id="fs_selector" class="col-md-10 col-md-offset-1" style="display: none;">
-                      <div class="well">
-                        <ul class="list-group">
-                          <li class="list-group-item list-group-item-success">
-                            Please select a file system type
-                          </li>
-                          <%= select_tag :fs_type, options_for_select([["Ext4", 0], ["Ext3", 1], ["NTFS", 2], ["FAT32", 3]], 0), class: "form-control" %>
+                      <ul class="list-group">
+                        <li class="list-group-item list-group-item-info">
+                          Please select a file system type
+                        </li>
+                        <%= select_tag :fs_type, options_for_select([["Ext4", 0], ["Ext3", 1], ["NTFS", 2], ["FAT32", 3]], 0), class: "form-control" %>
 
-                        </ul>
-                      </div>
+                      </ul>
                     </div>
 
                     <div id="mount_after_creation" class="col-md-10 col-md-offset-1" style="display: none;">
diff --git a/lib/modules/operation.rb b/lib/modules/operation.rb
index c827bb0..7b82e86 100644
--- a/lib/modules/operation.rb
+++ b/lib/modules/operation.rb
@@ -72,9 +72,15 @@ def create_new_partition_job params_hash
     raise "We don't support GPT yet" if device.partition_table != "msdos"
     raise "We don't support extended partitions yet, The number of partitions >= 3" if device.partition_count > 2
     DebugLogger.info "|#{self.class.name}|>|#{__method__}|:Params_hash #{params_hash}"
+
     device = Device.find_with_unallocated params_hash[:path]
     partition = device.partitions.select { |part| part.identifier == params_hash[:identifier] }.first
-    partition_size =  {start_sector: partition.start_sector, end_sector: partition.end_sector}
+    partition_divider = params_hash[:partition_divider].to_i
+    raise "Unknown partition size" unless [1, 2, 4].include? partition_divider
+
+    # calculate the position of the end sector
+    new_end_sector = partition.start_sector.to_i + ( (partition.end_sector.to_i - partition.start_sector.to_i) / partition_divider)
+    partition_size =  {start_sector: partition.start_sector, end_sector: new_end_sector}
     partition = device.create_partition partition_size
     filesystem = {fs_type: params_hash[:fs_type].to_i || 3 }
     partition.format_job filesystem