Weird WinXP (but maybe more clients) when creating Alternate Data Streams

Richard Sharpe realrichardsharpe at
Mon Feb 2 19:05:03 GMT 2009


Has anyone else seem the following behavior?

When creating a file that has alternate data streams (using either the
Windows Explorer or the DOS copy command) on a mapped share or from opening
up \\server\share, I see:

1. Base file created and data written.
2. ADS created and data written (often in one Write&X).
3. The data read back again multiple times at different granularities. Eg,
256 bytes at a time, 512 bytes at a time, 2048 and 4096. The number of reads
is enormous.

Has anyone seen a way to prevent Windows from doing this?

Richard Sharpe

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