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Weak sector data: Difference between revisions
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(Created page with "= Weak disk data = Some copy protections have what is described as `weak, random or floated' data. Each time the 'weak' sector is read one or more bytes will change, the v...") |
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Only two disk image formats ([[DSK format|Extended DSK]] and [[UDI format#UDI: Ultra Disk Image file format Version 1.1|UDI 1.1]]) can store this type of data. | Only two disk image formats ([[DSK format|Extended DSK]] and [[UDI format#UDI: Ultra Disk Image file format Version 1.1|UDI 1.1]]) can store this type of data. | ||
== Copy protection == | |||
Weak sectors used by [[Speedlock]] copy protection family for [[ZX Spectrum +3]] disks. | |||
Usually weak sector data used with other things for copy protection: | |||
* different sector length for different tracks | |||
* different sector length within a drack | |||
* deleted sectors | |||
* sectors with CRC error | |||
* wrong sector header informations e.g.: | |||
** track number | |||
** too long sector length | |||
== Disk images with weak sectors == | |||
Unfortunately, disk images with recorded weak sector data is very rare (There is no any disk image with weak sector data on [http://www.worldofspectrum.org/ WoS]). | |||
So if a game read the same sector repeatedly than semulators assume that sector has weak data.. | |||