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RDRVSX32: FAT32 RAM drive for HimemSX (Announce)

posted by Zyzzle, 14.03.2022, 06:12

> I had a request (via email) to create a
> RAM drive greater
> than 4GiB. It sort of works (works on his and mine 8GiB AMD, but has
> issues with his 32GiB Intel) so if anyone has the time and inclination to
> test, that'd be great.

Thanks very much for this FAT32 RAMdrive. It has been much-wanted for years. I tested the Super Extended Memory version, and didn't get errors either creating or copying files to a large RAMdrive. (I have 8G total RAM, but the program would only let me create a 5 GiB drive. Anything higher reported "Too big for system memory.) I'm using an Intel core i5 8250u laptop with 8GiB RAM, with CSM mode enabled in a UEFI BIOS which thankfully loads DOS bare metal.

I noticed some bugs:

-can only specify drive letter when used with the default option (specify ramdrive size in GiB), ie
rdrsx32 5,d creates a 5 GiB ramdrive in drive D
rdrsx32 5.5,d creates a 5 GiB ramdrive in drive D, the decimal point is ignored
rdrsx32 5500M,d creates a 5500M ramdrive in drive B, the first "drive" available in my system, NOT in drive d where I specified. Furthermore, this ramdrive in drive B gives many errors ("sector not" found) when writing files.

The ramdrive created in drive d works perfectly, in writing and copying files as large as 2 GiB. When attempting to decompress a .zip file containing a "blank" file of 4096MiB, DOS can't write this large file, giving errors. It is related to DOS not supporting unsigned filelengths, I believe. 2 GiB-1 seems to be the largest file I can create on the FAT32 RAMdrive in pure DOS (Microsoft "DOS 7.1."

Please fix the drive letter bugs, and the inability to specify floating point size of drive in GiB if possible.

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