ForensicsWiki will continue to operate as it has before and will not be shutting down. There may be some minor outages as we transition the site to new hardware, but we will try to minimize this as much as possible. Thank you for your continued support of ForensicsWiki.

Difference between revisions of "Windows SuperFetch Format"

From ForensicsWiki
Jump to: navigation, search
(SuperFetch DB files)
Line 50: Line 50:
 
|-
 
|-
 
|}
 
|}
 +
 +
==== Compressed blocks ====
 +
<b>TODO</b>
  
 
=== Compressed SuperFetch DB - MEM0 file format ===
 
=== Compressed SuperFetch DB - MEM0 file format ===
Line 57: Line 60:
  
 
This format uses the LZXPRESS Huffman compression method
 
This format uses the LZXPRESS Huffman compression method
 
==== Compressed blocks ====
 
<b>TODO</b>
 
  
 
==== File header ====
 
==== File header ====

Revision as of 07:25, 18 April 2014

Information icon.png

Please help to improve this article by expanding it.
Further information might be found on the discussion page.

SuperFetch, is a memory management scheme that enhances the least-recently accessed approach with historical information and proactive memory management. [1]

Note that the following format specification are incomplete.

SuperFetch DB files

The Ag*.db files are of the SuperFetch file format. E.g.

AgAppLaunch.db
AgCx_SC*.db
AgGlFaultHistory.db
AgGlFgAppHistory.db
AgGlGlobalHistory.db
AgGlUAD_%SID%.db
AgGlUAD_P_%SID%.db
AgRobust.db

The SuperFetch DB files can be stored in uncompressed or compressed form, where different version of Windows use different compressed forms:

  • Compressed SuperFetch DB - MEMO file format; Windows Vista
  • Compressed SuperFetch DB - MEM0 file format; Windows 7
  • Compressed SuperFetch DB - MAM file format; Windows 8

Compressed SuperFetch DB - MEMO file format

The MEM file consists of:

  • file header
  • compressed blocks

This format uses the LZNT1 compression method

File header

The file header is 84 bytes of size and consists of:

Offset Size Value Description
0 4 "MEMO" (0x4d, 0x45, 0x4d, 0x4f) Signature
4 4 Uncompressed (total) data size

Compressed blocks

TODO

Compressed SuperFetch DB - MEM0 file format

The MEM file consists of:

  • file header
  • compressed blocks

This format uses the LZXPRESS Huffman compression method

File header

The file header is 84 bytes of size and consists of:

Offset Size Value Description
0 4 "MEM0" (0x4d, 0x45, 0x4d, 0x30) Signature
4 4 Uncompressed (total) data size

Compressed blocks

The file header is followed by compressed blocks:

Offset Size Value Description
0 4 Compressed data size
4 ... Compressed data

The uncompressed block size is 65536 (0x10000) or the remaining uncompressed data size for the last block.

Compressed SuperFetch DB - MAM file format

The MAM file consists of:

  • file header
  • compressed blocks

This format uses the TODO compression method

File header

TODO

Offset Size Value Description
0 4 "MAM\x84" (0x4d, 0x41, 0x4d, 0x84) Signature

Compressed blocks

TODO

Uncompressed SuperFetch DB format

TODO

TRX files

The Ag*.db.trx files are of the TRX file format. E.g.

AgCx_SC*.db.trx

Note that the following format specification is incomplete.

File header

The file header is variable of size and consists of:

Offset Size Value Description
0 4 1 Unknown (Version?)
4 4 Unknown
8 4 File size
12 4 Maximum number of records (of the record offsets array)
16 4 Number of records
20 ... Record offsets array, where the record offset is a 32-bit integer. Unused record offset are set to 0.

Record

TODO describe

See Also

External Links