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Ríomhairí, Ríomheolaíocht Chun spás a leithdháileadh do chomhad ar an diosca, ní mór don chóras oibriúcháin tuairisc a choinneáil ar cé na haonaid leithdháiliúcháin atá saor, agus cé na cinn atá in úsáid cheana ag stóráil comhad eile. Modh amháin is ea liosta a choinneáil de na poill go léir. Is éard is poll ann, líon ar bith aonad leithdháilte atá buailte le chéile. Tugtar liosta saor ar an liosta seo.
Computers, Computer Science In order to allocate space on the disk for a file, the operating system must keep track of which allocation units are available, and which are already in use storing other files. One method consists of maintaining a list of all the holes, a hole being any number of contiguous allocation units. This list is called the free list.