Q. The UNIX sytem uses a/an ________ stored at the beginning of a some files to indicate roughly the type of file.

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Q. The larger the block size, the ______ the internal fragmentation.

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Q. In the sequential access method, information in the file is processed :

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Q. Sequential access method ______ on random access devices.

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Q. The direct access method is based on a ______ model of a file, as _____ allow random access to any file block.

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Q. For a direct access file :

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Q. A relative block number is an index relative to :

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Q. The index contains :

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Q. For large files, when the index itself becomes too large to be kept in memory :

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Q. _______ tend to represent a major bottleneck in system performance.

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Q. In UNIX, even an ’empty’ disk has a percentage of its space lost to ______

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Q. By preallocating the inodes and spreading them across the volume, we ___________ the system performance.

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Q. ____________ writes occur in the order in which the disk subsystem receives them, and the writes are not buffered.

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Q. In ___________ writes, the data is stored in the cache.

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Q. A file being read or written sequentially should not have its pages replaced in LRU order, because _____________

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Q. In the optimized technique for sequential access ___________ removes a page from the buffer as soon as the next page is requested.

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Q. With _______ a requested page and several subsequent pages are read and cached.

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Q. Some directory information is kept in main memory or cache to ___________

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Q. A systems program such as fsck in ______ is a consistency checker.

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Q. A consistency checker __________________ and tries to fix any inconsistencies it finds.

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