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- COREtest - Disk Performance Test Program v2.91
-
- This program will measure the performance of one or two hard disk
- drives. The evaluation is made using three tests: data transfer,
- random seek, and track-to-track seek. The program will not destroy any
- data on the disk and may be run as many times as desired.
-
- The data transfer test measures the performance of the computer, disk
- controller, and drive functioning as a combined unit. This is
- accomplished by reading repeatedly a specific block of data and timing
- each transfer. The resulting effective transfer rate is produced from
- the combined relationship of the computer bus structure (8, 16, or 32
- bits), the transfer rate of the controller with the drive, the
- interleave factor for which the drive was formatted, and the size of the
- data block transferred.
-
- The block size is automatically calculated or may be explicitly set from
- 1 to 64K in 1K increments. If automatically calculated, the block size
- will be set to 64K or the amount of data stored on one cylinder,
- whichever is less. The transfer rate is displayed in units of kilobytes
- per second (KB/sec). This indicates how much data will be moved from
- the disk to memory in one second.
-
- The next two tests measure the time required to position the read/write
- heads to a specific location where data is stored. The first of these
- tests will measure what is referred to as the "average access time" by
- moving the heads across one-third of the cylinders, simulating true
- random access. The final test will measure the time to move the heads
- from one track to an adjacent track, measuring the "track-to-track
- access time." Both these results are reported in milliseconds (ms =
- thousandths of a second). The smaller the access time, the faster the
- data may be located and transferred to the computer.
-
- After the tests are complete, a "performance index" is calculated for
- the tested system. This number measures the overall performance of a
- given computer, the disk controller, and its hard disk. It may be used
- to evaluate the performance of different computer systems on a
- comparable scale. For example, a standard IBM 10MB XT system will
- typically report an index of one while an IBM 20MB AT will yield an
- index of approximately 2.4. The higher the index, the more powerful the
- computer system. It can generally be said that a computer with a
- performance index of two is twice as fast as a computer with an index of
- one.
-
- Caching Information
- If COREtest detects that a cache program is installed, it will display
- a message indicating same. The presence of a cache program can mis-
- represent the actual drive performance. When comparing the performance
- of disk drives, you should do so without any cache programs installed.
- This will give a true representation of the actual drive performance.
-
- Ranking screen
- The final screen displays where your drive(s) rank compared to others
- in the industry.
-
- Various options are available to change the test parameters to better
- compare performance across a wide variety of applications. These
- options must be placed on the command line when program execution is
- started. The format of the command line and the option descriptions are
- given below:
-
- CORETEST [?] [HELP] [/B:xx] [/C:xxx] [/D:n[="xxx"]] [/P:xx] [/T:xxx]
-
- Format Description
- ------ -----------
- /B:xx Use a block size of xxK. The block size may be up to
- 64K. Default is the largest transfer possible without
- moving the disk heads.
- /C:xxx Set maximum seek stroke to xxx. This is used to set drives to
- equal cylinder comparisons. If not specified, then the full
- cylinder range of the drive will be used (default).
- /D:n[="xxx"] Test disk number n (n = 0-7). This parameter may appear
- up to two times. If a string is enclosed in quotes, then this
- string will be used to identify the drive on the display. If
- omitted, up to the first two drives will be tested.
- /P:xx Pause for xx seconds when test complete (for batch files).
- /T:xxx Perform transfer test for xxx seconds (default = 4 seconds).
-
-
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