It's a relic from the scene rules groups have to adhere when releasing their stuff in newsgroups.
The torrents you get are usually a reupload which keep the originals in tact.
3) Release Size:
3.1) Allowed split volume sizes are:
- 1,444,000 bytes
- 2,888,000 bytes
- 5,000,000 bytes
- 10,000,000 bytes
- 50,000,000 bytes
In the following paragraphs, utils make up for the majority of the releases in
the 0day scene, namely all applications, shareware games, etc. When we talk of
games, we mean the game-rip scene that releases ripped versions of store-bought
3.2) The utils disk limit is as of now 70 x 5,000,000 bytes or 35 x 10,000,000
bytes. This equates to a total of 350,000,000 bytes of compressed data. Volumes
of 1,444,000 and 2,888,000 bytes are allowed, as long as the release does not
exceed 99 disks. Oversize releases are allowed when no valid ISO release exists
and the group (or an iso group they work with) is not in possession of the iso
to release. In other words, there is NO size limit for 0day apps, except when a
valid (not nuked) iso exists!
3.3) The games disk limit is as of now 80 x 5,000,000 bytes or 40 x 10,000,000
bytes (or comparable for 1,444,000 and 2,888,000 bytes). This equates to a
total of 400,000,000 bytes of compressed data. Volumes of 1,444,000 and
2,888,000 bytes are allowed, as long as the release does not exceed 99 disks.
Any release must have less than 100 volumes. In case 10,000,000 bytes do not
suffice, you are allowed to use volumes of larger size; up to 50,000,000 bytes.