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From: rogerhef@matt.ksu.ksu.edu (Roger Heflin)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: Need driver for LARGE RAM disk
Keywords: RAM Disk
Message-ID: <1991May27.210905.136@maverick.ksu.ksu.edu>
Date: 27 May 91 21:09:05 GMT
References: <468@txsil.lonestar.org> <1991May27.043524.20211@uwasa.fi> <6602@vela.acs.oakland.edu>
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In <6602@vela.acs.oakland.edu> w8sdz@rigel.acs.oakland.edu (Keith Petersen) writes:

>[Some users say Ramdrive.sys doesn't work for very large ramdisks]

>If you use MicroSoft's Ramdrive.sys the commands are:

>device=ramdrive.sys [disksize (in Kbytes)] [sectorsize] [entries] /e
>   or
>device=ramdrive.sys [disksize (in Kbytes)] [sectorsize] [entries] /a

>Example:

>device=ramdrive.sys 1024 512 256 /e

>This makes a 1 megabyte ramdisk, in extended memory, which has 512
>byte sectors with 256 directory entries maximum in the root directory.
>For very large ramdisks you may run into limitations if you use sector
>sizes smaller than 512 because of the number of bits available in the
>FAT for each entry.  If 512 doesn't work, try 1024. (1024 is the
>maximum allowed).

Try the command:

device=ramdrive.sys 6144 521 256 /e

It will fail with the error message:

RAMDrive: Invalid Parameter

As far as I could see anything above 4M for the size, fails, no matter
what the other parameters are.  I also would like to know were a program
for a large ramdrive is.  
--
Rogerhef@Matt.ksu.ksu.edu                        Roger Heflin
                                                 EECE Grad Student
                                                 (913) 532-5600