Zaterdag is versie 4.0.0 van UltraDefrag uitgekomen, de eerste versie die pas echt het label 'stabiel' mag dragen volgens de ontwikkelaars. Dit opensource defragmenteerprogramma kan zijn werk doen op Windows NT en hoger. Aparte downloads zijn beschikbaar voor 32bit-, 64bit- en ia64-omgevingen en zijn gemiddeld slechts een paar honderd kilobyte groot. De release notes, die de opmerkelijke uitspraak bevatten dat de oude versies toch niet zo stabiel waren als aanvankelijk werd beweerd, zijn hieronder te vinden:
Changes in version 4.0.0:Beta Stage
- a lot of extremely important bugs were fixed
- the strongest error handling was added to all program modules
- program is available again for all 64-bit targets
- documentation was rewritten to be much clearer
- kernel mode driver was removed as a component less reliable by definition
- translations submitting is available again through our wiki
- USB keyboards support at Windows boot time was added
- all important program sources were well documented
All versions listed below were treated as stable and so on, but actually they were highly unreliable. Program's internal structure is very complex, it uses a lot of undocumented Windows calls. Therefore bug hunting was always extremely hard, especially in early days when an author had no enough experience.
In other words, all versions prior to 4.0.0 must be treated as products of the beta stage of program's development.
