Features In Windows Embedded; Ewf; Horm - Advantech SPC-515 Series User Manual

3.1

Features in Windows Embedded

SPC products support the embedded Windows platform. This section outlines the
important features (EWF and HORM), that are provided in Windows XP embedded.
3.2

EWF

EWF stands for Enhanced Write Filter. It provides an upper filter in the storage device
driver stack that redirects disk write operations to volatile (RAM) or non-volatile (disk)
storage. EWF protects a volume from write access. The benefits are as the following.
Write-protect one or more partitions on your system.
Enable read-only media, such as CD-ROM or flash, to boot and run.
Prolong the lifespan of write-sensitive storage, such as CompactFlash.
SPC-218/221 XPE provides EWF RAM-REG mode on system partition. All writes to
the system partition will be redirected to RAM once this mode is enabled. This mode
is manually enabled by customers after they finish all their changes on the system
such as installing their applications or adjusting system settings.
Advantech provides a pair of utilities to operate EWF, OSLock and OSUnLock. Refer
to the training slide in the folder: "Advantech XPe Add-one.pdf".
3.3

HORM

HORM stands for Hibernate Once Resume Many. In HORM environment, a single
hibernation file is used to boot the system repeatedly. To set a HORM environment,
please follow the steps below.
Make sure EWF is disabled. You can run OSUnLock to disable EWF.
Enable hibernation support:
Run "power options" in control panel, and then select "Enable Hibernation" in hiber-
nation pane.
Enable EWF:
Run OSLock, and then system reboot automatically.
Open those software that customers want to directly use after system resume from
hibernation.
Hibernate via Advantech HORM utility:
Click Start Menu->All Programs->Advantech->AdvWF
HORM environment remains all along unless the following events occur:
Run EWF commit command (ewfmgr c: -commit) and then reboot system.
Select "Discard hibernation file" by clicking F8 when system is starting up.
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