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SMARTDRV.DOC File

(C) Copyright Microsoft Corporation, 1992

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This file has 2 parts:

Part Contents

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but it can reduce the amount of time your computer spends reading data

from your hard disk. SMARTDRV.EXE replaces the older version,

SMARTDRV.SYS, and is compatible with all versions of Windows 3.x.

SMARTDRV.EXE sets aside some expanded or extended memory as a cache for

its own use. SMARTDRV.EXE uses this disk cache to store the information

read from the hard disk when an application needs information from your

hard disk. When an application attempts to read additional information

from the hard disk, the SMARTDRV.EXE program supplies the information

directly from its cache instead. If you are using RAMDRIVE.SYS to create

one or more RAM drives, and are limiting the memory assigned to

can also be loaded into HMA with third-party memory managers such as

386-Max.

SMARTDRV.EXE must be specified in both your AUTOEXEC.BAT file and

CONFIG.SYS file because there are actually two device drivers in a single

file: a double-buffer driver and a disk cache. The double-buffer driver is

installed in CONFIG.SYS, and the cache component of SMARTDRV.EXE is

installed in AUTOEXEC.BAT. Some disk controllers do not need double

buffering; using this option when you do not need it results in a small

performance penalty. Therefore, once your system is running with

SMARTDRV.EXE, type:

Cache size while running Windows: 1,048,576 bytes

Disk Caching Status

drive read cache write cache buffering

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A: yes no no

B: yes no no

C: yes yes yes

D: yes yes -

For help, type "Smartdrv /?".

Note

If every line in the Buffering column is No, then you can safely remove

SMARTDRV.EXE always copies data to your hard disk when you turn off your

computer. It also writes all data to the disk when an application calls

disk, use the /C command-line option. If you use a third-party program to

You can use command-line options to control the size of the cache element

(/E) and the size of the read-ahead buffer (/B). The read-ahead buffer is

additional information that SMARTDRV.EXE reads when the application reads

information from the hard disk. The size must be specified in bytes, and

the element size must be one of the following: 1024, 2048, 4096, or 8192.

The read-ahead buffer must be a multiple of the element size, cannot be

less than the element size, and cannot exceed 32768. The defaults are 8192

for the element size and 16384 for the read-ahead buffer. Because these

will occupy conventional or UMB memory space, making them larger reduces

the memory MS-DOS applications have available.

[[WinCacheSize]] ]] [[/B:BufferSize]]

[[/C]] [[/R]] [[/L]] [[ /Q]] [[/S]] [[/?]]

The following list describes the command-line options available for

SMARTDRV.EXE:

drive

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Specify the letter of the disk drive for which you want to

control caching. If you don't specify a drive letter, floppy disk

Enable (+) or disable (-) caching. Use the plus (+) and minus (-)