Advantech TPC-1250H, User Manual

TPC-1250H/1550H/1750H User Manual

14

3.1

Features in Windows XP Embedded 

TPC product supports 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 DVD or flash, to boot and run.
Prolong the lifespan of write-sensitive storage, such as CompactFlash.

TPC-1250H/1550H/1750H XPE provides EWF RAM-REG mode on system partition.
All write to 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 system
such as installing their applications or adjusting system setting.

Advantech provides a pair of utilities to operate EWF, OSLock andOSUnLock. Please
refer the training slide in the folder, file name is “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.

Please 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: 
Please 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.