s. According to a first aspect of the present invention there is provided a method of controlling access to and modification of information stored on a storage medium forming part of a computer system comprising: dividing information stored on the storage medium into a plurality of non-overlapping partitions including a boot partition and at least one general partition, characterised by designating at least one of said partitions a Write Many Recoverable (WMR) partition wherein, in use, if a write command is issued to overwrite any 