File : Repair collection makes it possible to recover from integrity problems in your collection (e.g. as a result of physical damage to the collection files). You can quickly run Repair collection by choosing Ctrl+F12 or clicking the red-cross icon on toolbar

Note that recovery is only possible in full access mode. To turn full access on choose Tools : Options or press Ctrl+P and select Full access at Data access : Access mode

Integrity problems in a collection may appear in case of hardware or system software problems. Bad clusters, lost sectors, data corruption, etc. can often be remedied by replacing affected files (e.g. corrupted AVI file, etc.). However, if the problem occurs in SuperMemo index files or files storing optimization data used by repetition spacing algorithm, only File : Repair collection can remedy the problem.

Important! Never run Repair before making a back-up copy of your collection files (e.g. with File : Tools : Semi-Copy)!

Before you begin recovery, choose appropriate recovery options in Recovery Options dialog box.

Repair collection does not recover from some error types. Here are some errors that are not remedied with Repair collection:

• damage to binary files such as BMP, WAV, AVI, EXE, etc. Replace these file from the original CD-ROM or from your back-up storage. If you do not have a backup of these files, you will have to remove them by using Delete in the relevant registry, or recreate them in any other way.
• damage to OF matrix, RF matrix, Cases matrix, etc. These matrices are stored in the file with the extension KNO. In case of errors indicating damage to these data structure, use File : Tools : Reset parameters : Optimization matrices. You will lose some of data collected by SuperMemo about your performance with a given learning material, but you will be able resume your work without losing the learning process. Alternatively, you might restore SM8OPT.DAT file from one of your earlier backups
• damage to text files such as TRA, SCR, INI, etc. View these files in any text editor and change their contents. You can also edit legal TRA files with Tools : Options : Language : Localization table
• Read more: Files used by SuperMemo

Note: If you encounter problems that could not be remedied with File : Repair collection (except for those listed above), please report it to SuperMemoMail (please make a back-up of copy of the damaged collection, e.g. with File : Tools : Semi-Copy).