NTFS:-> Metadata Compressed or not???

NTFSD
1

HI,

I just wanted to know if any of u can confirm what all is meant by the fact that ‘NTFS Metadata is not in the compressed state on the disk, for a compressed file’.

Metadata here surely refers to the MFT Record Entry of a file, $FILENAME attribute of a file, $STANDARD_INFORMATION attribute & the other attributes. Or is it not?

What about $SECURITY_DESCRIPTOR attribute? If by some rare chance it actually happens to be non-resident & on top of that greater than 16 clusters on disk. Will it be compressed when the file is compressed???

And, what about Named Data attributes?? I personally found that named data attributes of a compressed file turn out to be uncompressed even when greater than 16 clusters in size. Does it meant Named Data is also MetaData???

Thx for ur time & consideration.
Mayank.

2

Did you try opening the named (alternate) data stream and sending down the
compression FSCTL? I would expect the compression state to be maintained on
a per stream basis since each (non-resident) stream has its own set of
clusters.

-----Original Message-----
From: Mayank Kulshreshtha [mailto:xxxxx@legato.com]
Sent: Sunday, June 04, 2000 10:34 PM
To: File Systems Developers
Subject: [ntfsd] NTFS:-> Metadata Compressed or not???

HI,

I just wanted to know if any of u can confirm what all is meant by the fact
that ‘NTFS Metadata is not in the compressed state on the disk, for a
compressed file’.

Metadata here surely refers to the MFT Record Entry of a file, $FILENAME
attribute of a file, $STANDARD_INFORMATION attribute & the other attributes.
Or is it not?

What about $SECURITY_DESCRIPTOR attribute? If by some rare chance it
actually happens to be non-resident & on top of that greater than 16
clusters on disk. Will it be compressed when the file is compressed???

And, what about Named Data attributes?? I personally found that named data
attributes of a compressed file turn out to be uncompressed even when
greater than 16 clusters in size. Does it meant Named Data is also
MetaData???

Thx for ur time & consideration.
Mayank.