Intel TPC-1070 user manual Ewf, Horm

Chapter 5 Windows XP Embedded

TPC-1070 is in support of embedded windows platform. This section is to state the important features, EWF and HORN, provided in windows XP embedded.

5.1 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.

TPC-1070 XPE provides EWF RAM RDG mode on system partition. All wirte to system partition will be redirected to RMA 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 adjust- ing system setting.

Advantech provides a pair of utilities to operate EWF, OSLock and OSUnLock. The setting is stated in the section later.

5.2 HORM

HORM stands for Hibernate Once Resume Many. In HORM environ- ment, 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 Hiberna- tion’ in hibernation pane.

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