Final answer:
Unstructured file organization lacks a definite structure, requiring exhaustive search for accessing records, in contrast to structured organization which allows quicker search methods.
Step-by-step explanation:
Because there is no structure to the unstructured form of file organization, record access is by exhaustive search. In unstructured file organization, data does not follow any particular format or sequence. Each record might be different and does not have a standardized data model. This means that to find a particular piece of information, the system must go through each record in its entirety until the desired data is found, a process known as an exhaustive or linear search.
This is in contrast to structured file organization, where data is stored according to a predefined format, allowing for quicker search methods such as index-based searching or hashing. In sequential file organization, records are stored one after the other without any specific order or structure. To access a specific record, the system has to search through each record in the file until it finds a match, which can be time-consuming.