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Weak sector data

64 bytes removed, 19:55, 21 February 2016
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= Weak disk Some copy protections have what is described as “weak”, “random” or “floated” data =.
Some copy protections have what is described as 'weak', 'random' or 'floated' data. Each time when the 'weak' “weak” sector is read one or more bytes will change. Their value
may be random between consecutive reads of the same sector.
Weak data can only be recorded with only using modified hardware, so you cannot easily copy these disks without 'crack' the copy protection.
Only two disk image formats (the [[DSK format|Extended DSK]] and [[UDI format#UDI: Ultra Disk Image file format Version 1.1|UDI 1.1]]) can store disk image formats record this type of data.
== Copy protection ==
Weak sectors are used by the [[Speedlock]] family of copy protection family routines for [[ZX Spectrum +3]] disks.
Usually weak sector data is combined with other unusual things techniques for disk copy protection, such as:* different sector length lengths for different tracks* different sector length lengths within a track
* sectors marked as deleted
* sectors with CRC error
* wrong incorrect sector header informations information e.g.:** incorrect track number** too long increased sector length
== Disk images with weak sectors ==
Unfortunately, disk images with recorded the weak sector data is very recorded are rare (There is no any disk image with weak sector data on [http://www.worldofspectrum.org/ WoS]). So , so if a game read program reads the same sector repeatedly than simulators then some emulators assume that this sector has weak data..(which emulators?)

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