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1990-05-04
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DoubleDisk (tm) Version 2.13 Release Notes
Copyright (c) 1989,1990 by Vertisoft Systems, Inc.
Copyright (c) 1989,1990 by MITAN Software Int'l (1989) Ltd.
Vertisoft Systems, Inc.
150 Highway 9
Freehold, NJ 07728
===================================================================
Release Notes
=============
1. The manual reflects program versions 2.12 and 2.13.
2. This new release features several advantages over previous
releases:
* Much faster operation
* New File UNerase support scheme
* New "Full Shrink" option for maximum shrinking
of Extended Disks
* Comprehensive Verify and Recover Options
* Complete DOS 4.x support
DoubleDisk Installation Notes
=============================
3. Before installing DoubleDisk, it is highly recommended that
you perform "Gap Compression" on the Host Drive. By "Gap
Compression" we mean reorganization of the files on your hard
disk so they will not be too cluttered.
As stated in the User's Guide, it is not advisable to use "Gap
Compression" utilities with Extended Disk's, as they have no
effect at all on the Extended Disk's performance due to
DoubleDisk's propriety FAT scheme handling.
Even though such utilities usually WORK with DoubleDisk, they
might cause Actual Size inflation of small files, causing
degradation of the overall compression ratio. The Actual Size
those files occupy on the Extended Disk might sometimes be
BIGGER than their DOS size.
This problem will be fixed in the next release.
Refer to Appendix D in the DoubleDisk User's Guide for more
information.
When installing DoubleDisk, the installation procedure saves
the original AUTOEXEC.BAT & CONFIG.SYS into AUTOEXEC.DBL &
CONFIG.DBL respectively.
Virtual Capacity
================
4. * With DOS version 4.x, Compaq Dos 3.31, or Zenith Dos 3.3
Plus, the default Virtual Capacity is 128MB. Due to the
better disk management methods available with these
versions of DOS, there is no need to select lower Virtual
Capacities. A Virtual Capacity of 256MB is advised for
Extended Disks larger than 100MB. Selecting a Virtual
Capacity of 256MB will cause no performance degradation.
* With other DOS versions, higher Virtual Capacity
selection may cause slight speed and compression ratio
degradations, as well as larger RAM memory consumption.
Therefore, select the Virtual Capacity with care. As a
rule of thumb, with these DOS versions, the SMALLER the
Virtual Capacity selected - the better.
* With ALL DOS versions, when creating NEW Extended Disks,
it is best to choose the default value for the Virtual
Capacity as suggested by DDUTIL. Specifying a smaller
Virtual Capacity will provide no additional benefit.
Larger Virtual Capacity is to be selected only in
accordance with the largest amount of data expected to be
stored on the Extended Disk.
Supported Extended-Disks Size and Virtual Capacity
==================================================
5. The supported Extended Disk size depends on the DOS version in
use:
* DOS version 2.x: Each Extended Disk drive can occupy
up to 16 MB on the Host Drive (with Virtual Capacity
of up to 32 MB).
* DOS version 3.x: Each Extended Disk drive can occupy
up to 64 MB on the Host Drive (with Virtual Capacity
of up to 128 MB).
* DOS version 4.x, Zenith DOS 3.3 Plus & Compaq DOS
3.31: Each Extended Disk drive can occupy up to 128
MB on the Host Drive (with Virtual Capacity of up to
256 MB).
IMPORTANT! This version does not support Host Drives with
sector size greater than 2K (used with Host Drives
larger than 128MB with DOS versions OTHER than DOS
4.x, Zenith DOS 3.3 Plus, and Compaq DOS 3.31).
Extended Disk Integrity Checking
================================
6. You should frequently use the DDUTIL Verify function in order
to assure the integrity of your Extended Disks. The Verify
fuction can be used only with Inactive Extended Disks. (Refer
to the User's Guide for more information).
If Verify finds any inconsistency problems, it displays a
proper message, e.g.: Lost Cluster or Lost Chains found. (this
might happen with regular DOS drives as well).
If such a message appears, Verify will offer to correct the
inconsistency problem, and will display the following prompt:
Correct FAT <Y/N> ?
Correcting the FAT might cause loss of data (just as with DOS
drives). We suggest that you first backup the files on the
Extended Disk before correcting the FAT. Answer "N" to the
prompt, Activate the Extended Disk (using the DDUTIL Assign
function), backup the files, and apply the Verify function
again, this time typing "Y" to the prompt.
DDIR reports that Actual Size is BIGGER than DOS size
=====================================================
7. This problem may occur if either a "Gap Compression" utility
was used with the Extended Disk (see above), or if the file
has a very small compression ratio potential.
This is due to the fact that the files are stored as is, but
DoubleDisk uses some overhead tables which might cause this
inflation.
Incompatibility with certain software utilities
===============================================
8. Norton Disk Doctor (NDD)
DoubleDisk is currently not compatible with NDD due to the
fact that NDD treats the Extended Disk as a physical drive
rather than sa a logocal drive.
This problem is being worked out with Norton Computing Inc.,
and it will be fixed in future releases.
9. Gazelle Systems' Quick DOS II (QD2)
A problem was reported when using QD2 with directories con-
taining more than 256 files.
This problem is now being worked out.
General Notes
=============
10. This version of Double Disk is NOT compatible with earlier
versions of Double Disk. Extended Disks created by earlier
versions than this should be re-formatted using the DDUTIL
utility version 2.13.
11. This version of Double Disk is NOT compatible with Local Area
Networks (LANs).