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The Windows XP Embedded CF card, which is provided for
Pro-face panel computers, is equipped with the EWF (Write
Filter) function.
■ What is EWF?
■ What is
this function for?
■
EWF Function Description
■ Detailed
information
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What is EWF? |
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EWF is a function which protects a CF card
from writing. Enabling this function prevents data writing to
a CF card.
When EWF is enabled:
Data cannot be written to a CF card
When EWF is disabled: Data can be written to a
CF card |
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What is this function for? |
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If the EWF function is enabled, the data in
a CF card is protected from erroneous writing including
operational errors, unintended update, or deletion. Also this
function prevents the lifetime being reduced by the number of
writings to a CF card.
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| IMPORTANT |
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Windows XP Embedded needs to be restarted
after you change the settings of
disabling/enabling the Write Filter. |
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The EWF settings cannot be applied
to external drives other than the Windows XP
Embedded CF card, such as a USB flash drive or a
CF card for data writing via a PCMCIA connector.
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Turning off the power when writing
to a CF card may result in damaged or lost data.
The Write Filter must be enabled. |
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Turning off the power when starting
Windows XP Embedded may damage or lose the EWF
settings information.
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EWF Function Description |
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Even when the EWF function is enabled,
information is updated as well as in the general hard disk
environment. But why can information be updated even if the
write protection is active? The followings explain data
actions when the EWF function is enabled and data is
updated.
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When the write filter is
enabled
The access to a CF card is as
shown below:
- Read: Direct access to a CF card
-
Write: Access to the memory |
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When the write filter
is disabled
The access to a CF card is as
shown below:
- Read: Direct access to a CF card
-
Write: Direct access to a CF card |
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Detailed information |
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For the detailed information, refer to the
Windows XP Embedded reference manual.
Windows® XP Embedded 2G (NTFS) Reference
Manual |
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