It allows programs to read and write logical records within physical blocks of data, as opposed to the less advanced Basic sequential access method ( BSAM ) which allows programs to access physical blocks of data, but provides no support for accessing logical records within blocks.
42.
In addition, speed may vary markedly between writing a large amount of data to a single file ( sequential access, as when a digital camera records large photographs or videos ) and writing a large number of small files ( a random-access use common in smartphones ).
43.
This made manual multiplication easier, as one needed to follow two parallel columns ( instead of a vertical column and a horizontal row in the matrix notation . ) It also sped up computer calculations, because both factors'elements were used in a similar order, which was more compatible with the sequential access memory in computers of those times mostly magnetic tape memory and drum memory.
44.
:: I did a speed test of sequential access my SSD vs . HD . the SSD does about 395MB / sec whereas the HD does 175MB / sec, so the SSD is 2.25x as fast . ( Of course, random access will show a much larger benefit to the SSD . ) So I think swapping to an SSD instead of a HD will be about twice as fast.
45.
:: : I believe that's just a more formal way of saying the same thing, to prevent somebody from claiming that sequential access is random access, since they can, of course, retrieve a million records and toss out all but the last one, but this would be maybe a million times slower than just reading the last one immediately . talk ) 20 : 30, 19 May 2015 ( UTC)
46.
For this purpose, the normal X'02'command, which is simulated by the CPU, is taken to be a standard sequential read command on card and tape media ( which are inherently sequential access in nature ), but a special Read-IPL command on hard disks ( which are inherently random access in nature; hard disks use a related, but different, read-type command, X'06', and others, for sequential, non-IPL reads ).
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