Lenovo S21e-20 User Manual page 25

How can I determine whether the Windows running on my computer is
WIMBoot enabled?
WIMBoot technology is normally enabled on copies of Windows 8.1
Update running on SSD (or eMMC) -only computer models. To check your
computer,
1 On the charms bar, click the Search charm.
2 Make sure Settings or Everywhere is selected as the search scope and
type Disk Management in the search box.
3 Click the search result and the Disk Management program starts.
If Wim Boot is labeled on the Windows partition (as illustrated), WIMBoot
is enabled on your copy of Windows.
Chapter 3. Recovery system
21