Subj : How to detect RAM disks (Was: how to detect cdrom?)
To   : Klaus Meinhard
From : Gerald Miller
Date : Mon Feb 25 2002 12:26 pm

From: Gerald.Miller@f512.n342.z1.cereal.mv.com (Gerald Miller)
Subject: How to detect RAM disks (Was: how to detect cdrom?)

Hello Klaus,

  Monday February 25 2002 08:46,
  Klaus Meinhard wrote to Jasen Betts:

 >> some common qualities: when you boot the drive will be empty.
 >> (except for a volume label)
 >>
 >> it'll have a higher drive letter than any physical disk it'll
 >> also be non-removable, writable (and have free space) unlike
 >> a cd-rom.

 KM> It will probably be the smallest drive in MBytes.

 KM> But the fact remains: you can make a lot of nonstringent tests. Any of
 KM> these facts _could_ apply to another (hard) disk. On the other hand
 KM> it's trivial to write a test for a known configuration.

 KM> The best bet for a general ramdisk test might be the existence of a
 KM> single FAT. But is it really general? The existence of a formattable
 KM> ramdisk may mean this one  has 2 FATs.

I have a small program named: MEM.EXE.  When I type:

      mem /module ramdrive > MEM.OUT

I get the following:

=== Cut Begin: MEM.OUT ===
RAMDRIVE is using the following memory:

  Segment  Region       Total        Type
  -------  ------  ----------------  --------
   0B14A       1       1184    (1K)  Installed Device=RAMDRIVE
                   ----------------
  Total Size:         1,184    (1K)
=== Cut End:   MEM.OUT ===

Can the command: mem /module %module_name not provide the
information that you are seeking?

I can type:

      mem /c > E:\Tmp\MOD_NAME.DAT

I can get a list of memory modules and with a little creative
editing, I can get a list of module_names and should be able to
use the edited list as input to a command:

      for %%mod in (at e:\tmp\mod_name.dat) do call mem /module %mod

and I can see all the installed devices with other information...

which brings me to the following point:

Can you not take a previously created MOD_NAME.DAT file and use
it as imput to test for other installed devices?

           Cheers ... Gerald
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