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In this guide, we will describe some of the possible causes that can cause the iosubsys error, and then we will look at some ways to fix this problem. Error: The I / O subsystem driver could not be weighted. Either the file in the .iosubsys subdirectory is literally corrupted, or the system is low on memory. This issue can occur if all memory less than 1 MB is initially allocated to initialize Ios.vxd. Ios.vxd must delegate less than 1MB of memory to be able to use it with a real mode buffer.
PRB: Windows 95 May Not Start Due to I / O Subsystem Error
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The information in this article applies to:
Microsoft Windows 95
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SYMPTMS
Under certain circumstances, Windows 95 may crash with the trunk and display the following error message:
Error: Failed to load the driver for the I / O subsystem. Or a file in a subdirectory. The Iosubsys is corrupted or the system is still out of memory.
REASON
This issue can occur if all memory less than 1 MB is allocated before Ios.vxd is initialized. Ios.vxd has to allocate less than 1MB of memory to even use it as a real mode buffer. If Ios.vxd cannot allocate memory for this situation, it cannot be loaded, which in turn prevents Windows 95 from starting. Below
1 MB of memory is usually reserved for components that need it most. However, it is possible that Windows 95 allocates between 1 MB and 16 MB of memory during initialization, which will force the system DMA buffers (which must be less than 16 MB) less than 1 MB and prevent Ios.vxd from cutting the budget below 1 MB of memory. …
RESOLUTION
The workaround is always to adjust the maximum size of the memory cache allocated to Vcache using .vxd. Vcache.vxd allocates an excellent initial cache size that does not exceed 9 MB. Setting the maximum cache length and size to less than 9 MB also removes the initial cache size, freeing up Up to less than 16MB of memory and allowing Windows 95 to start or start correctly.
The maximum cache size is determined by simply adding the “maxfilecache” line to cache the main System.ini section. Here’s what an entry in System.ini might look like to set the maximum cache size to 6 MB:
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[vcache]
maxfilecache = 6144
STATE
This is a known issue with Windows 95. It was required for Windows 98.
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