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may be random between consecutive reads of the same sector.
Weak data recorded
with only modified hardware, so you cannot copy these disks without 'crack' the copy protection.
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 combined with other
unusual things for copy protection, such as:* different sector length for different tracks* different sector length within a track
* sectors marked as deleted
* 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 simulators assume that this sector has weak data. .