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Stacker 3.1 for Windows and DOS - Late Breaking News This document contains information not included in the Stacker 3.1 Supplement or the Stacker for Windows & DOS User's Guide. If you're using any unique software with your system, such as Super PC-Kwik Cache, see the Stacker Setup Help. To get Stacker help from Windows: 1 Double-click the Stacker Setup icon. 2 Press F1. 3 Click Contents. 4 Click Software Considerations. To get Stacker help from DOS: 1 Change to the Stacker directory and type SETUP. 2 Press F1. 3 Press ENTER to choose the Index. 4 Press TAB to select Software Considerations and press ENTER. IMPORTANT: IT IS A GOOD IDEA TO PRINT THIS README.TXT FILE SO YOU CAN REFER TO IT EASILY. TABLE OF CONTENTS 1.0 Stacker 3.1 and MS-DOS 6 Preloading 2.0 The STACKER.INI File 2.1 STACKER.INI Structure 2.2 General Syntax rules 2.3 Switches 2.4 Mounting Parameters 2.5 Editing your STACKER.INI File 2.6 Example for a Single Stacker Drive 2.7 Example for Multiple Stacker Drives 3.0 Converting DoubleSpace Disks Outside of Setup 3.1 DCONVERT Syntax 3.2 Converting an Unmounted DoubleSpace Drive 3.2.1 Mounting a Stacker Drive Temporarily 3.2.2 Mounting a Stacker Drive Permanently 3.3 Converting a Removable Disk Compressed with DoubleSpace 3.4 Interrupted Conversion 4.0 File Duplication on Compressed and Uncompressed Drives 4.1 Duplication Required by Stacker 3.1 4.2 Duplication Not Required after Upgrading from Earlier Stacker 5.0 Doubling the Capacity of RAM Drives 6.0 Using Stacker for OS/2 & DOS with Stacker 3.1 7.0 MS-DOS Command Equivalents 8.0 Upgrading Stacker 3.1 on a Startup Disk That is Mounted Replaced 9.0 Compatibility Issues 9.1 Using Anti-Virus Programs 9.2 Using NetX with Stacker 3.1 (Novell Networks) 9.3 Using the Adaptec Controller with Stacker 3.1 and DOS 6 9.4 Using Norton Utilities version 7.00 STACKER 3.1 FOR WINDOWS & DOS README.TXT 1.0 Stacker 3.1 and MS-DOS 6 Preloading Prior to DOS 6, changes to your system configuration were were specified in the CONFIG.SYS file. MS-DOS 6 loads DBLSPACE.BIN (a device driver) before it processes CONFIG.SYS. As supplied with MS-DOS 6, DBLSPACE.BIN configures DoubleSpace compression. Stacker 3.1 Setup modifies DBLSPACE.BIN to configure Stacker 3.1 compression and serve as a Stacker device driver instead. Then it creates a hidden file named STACKER.INI to provide Stacker configuration information to DBLSPACE.BIN. At start up, MS-DOS 6 preloads and processes DBLSPACE.BIN before it looks for any other file. DBLSPACE.BIN uses the information in the STACKER.INI file to configure your system and load the Stacker driver into memory. 2.0 The STACKER.INI File The STACKER.INI file contains configuration information for the Stacker device driver. It replaces the Stacker device driver statements used in the CONFIG.SYS file in previous Stacker versions. STACKER.INI is a hidden file in the root directory of your boot drive. Setup creates STACKER.INI if it doesn't already exist and modifies its contents if you create a Stacker drive on any device except a floppy disk drive. Several Stacker commands update STACKER.INI whenever they change the configuration of your system. Here's a sample STACKER.INI file: /P=1 /DIR=C:\STACKER\ C:\STACVOL.DSK,SW The /P switch controls how fast Stacker compresses data when it puts it on the disk. The /DIR switch tells DOS where to find the Stacker files. The last line loads the Stacker drive and assigns a new drive letter. SW exchanges or swaps the drive letters, so the data is still referenced by the original drive letter. NOTE: Normally, you won't need to edit this file. Setup takes care of the initial configuration and other commands keep STACKER.INI up to date. 2.1 STACKER.INI Structure Each statement or switch in STACKER.INI appears on a separate line. Switches appear at the beginning of the file, while all of the drive specifications appear at the end. The switches can be listed in any order. The order of the drive specifications is the order in which drive letters are assigned. Section 2.5 explains how to edit your STACKER.INI file. 2.2 General Syntax Rules Each line can contain one switch or drive specification. A drive specification can be followed by a comma and a mounting parameter (RP,SW, or NS). Switches can include spaces and tabs before or after "=", but not after "/". You may want to modify the STACKER.INI file to change switches or to cause other effects. 2.3 Switches The following switches may be found in the STACKER.INI file. * Reserves a drive letter. If you convert DoubleSpace drives to Stacker drives or use Unstack to decompress data on a Stacker drive, Setup uses the * to maintain the previous drive letters. You can use * to force Stacker to assign specific drive letters CD-ROM drives or network drives, if necessary. /-AUTO Turns off automounting for all removable drives. This saves about 2.7 KB in the driver. /BD=x Specifies the base drive letter (x) from which to start Stacker drives. This appears if Stacker converted from DoubleSpace drives to maintain the DoubleSpace drive letter assignments. For example, if the first DoubleSpace drive was assigned to drive letter F, the switch /BD=F appears in STACKER.INI and F is assigned to the first Stacker drive. /C or /C=n Specifies the cluster size as the default (/C) or 4, 8, 16, or 32 KB. This value is established when the Stacker drive is created and must not be changed. /DIR=<stacker path> Specifies the path where the Stacker software is located. This switch generally occurs at the top of the STACKER.INI file. /EMS Indicates that Stacker's disk cache (up to 64 KB) should be stored in expanded memory, if any is available. /I- Turns off Stacker's interceptor used with Novell networks. /LHF- Turns off Stacker's normal clearing of the cache used by SmartDrive under MS-DOS 6 when any application ends. /M=n Sets the cache memory size to n KB. Use any value between 1 and 64. The amount of driver memory required increases by whatever you specify up to a maximum of 64 KB for the cache (The /M switch has no effect if you use it with /EMS.) /P=n Sets the compression tuning. Use any value between 0 and 9. 0 turns compression tuning off decreasing memory requirements by 4.4 KB. You'll have to restart your system to take advantage of any change in tuning if you change between 0 and any other value. If no /P switch is included, Stacker uses /P=1. Values 0 and 1 are the fastest, with standard compression. 9 gets the best compression but takes a bit longer. Setup uses level 9 to get the best possible compression while creating the Stacker drive. /Q- Turns off normal quiet startup. This switch causes your Stacker drives and their uncompressed drives to be listed at Startup, along with other program and copyright information. /RP=n Sets the number of replaceable drives to reserve, in addition to any specific drive specifications. /SW=swap-pairs Sets up multiple swapping that takes place after individual drives are mounted and swapped. If necessary, use /SW to specify swapping to occur after all Stacker drives are mounted. See the end of Section 2.4 Mounting Parameters for more details. /W- Disables Windows permanent swap file pointer updating. By default, if Stacker detects a Windows permanent swap file on a disk that was swapped, Stacker searches through its preset pattern for the Windows directory and places the full path of the Windows permanent swap file in SPART.PAR in the Windows directory. Once this is done (the first time you restart your system after compressing the disks that contain the permanent swap file), it really doesn't have to be done again unless you make drastic changes to your system. If you add this switch to the STACKER.INI file, the search won't take place and you'll save a bit of time at startup. NOTE: Stacker checks for a Windows permanent swap file every time you restart your system. You can include the /W- switch to shorten startup time even if you don't have Windows. /W=<directory> Names the directory that contains your permanent swap file pointer (SPART.PAR). Use this switch if your directory has an unusual name or isn't on the default path that Stacker searches. If Windows can't find its permanent swap file after you compress a disk, add this switch and restart your system. This switch tells Stacker exactly where to find the SPART.PAR file, saving a bit of time on startup. Replace it with /W- after Windows finds its swap file. /W+<directory> Names the directory that contains your permanent swap file. Use it if your directory has an unusual name or isn't on the default path that Stacker searches. It causes Stacker to search its regular default path and find this one too, just in case you have multiple swap files. This switch actually lengthens the search, but ensures that it finds all the files. 2.4 Mounting Parameters The following parameters appear after a STACVOL statement that specifies a Stacker drive. These parameters specify the mounting method for the Stacker drive. A comma precedes each one. RP Mount replaced. Useful for removable and RAM disks. NS Mount without swapping, using the next available drive letter. Used for additional Stacker drives on the same original disk. SW Mount swapped, using the next available drive letter. Used for the first Stacker drive on a fixed disk. To set up swapping to occur after all Stacker drives are mounted, use the /SW switch. To set up multiple swapping, use a line like this: /SW = jk mn xy After mounting all drives, Stacker will swap drives in pairs: J: with K:, M: with N:, X: with Y:, and so on, up to 26 swaps. Most users don't need multiple swapping, because the mounting parameter "sw" on the STACVOL line handles swapping on an individual drive basis. If you use the /SW = switch, put it at the TOP of the file along with the other switches. It will be processed after all the drives have been mounted. 2.5 Editing Your STACKER.INI File STACKER.INI is located in the root directory of your uncompressed boot drive. To edit it with your usual text editor, first change the hidden attribute. Alternatively, Stac provides the STACINI editor for you to use. 1 At the DOS prompt, type STACKER and press ENTER. 2 Note the drive letter of STACVOL.DSK listed for drive C. 3 At the DOS prompt, type STACINI drive: where drive: is the letter identified in step 2. 4 When the lines of the file appear, edit as required (see the switches in the following section). 5 Press Ctrl-Z to save the file. 6 Restart your computer to put any changes into effect. 2.6 Example for a Single Stacker Drive The sample computer has a single hard drive and expanded memory. The STACKER.INI file created by Express Setup contains these lines: /DIR=C:\STACKER\ | Where Stacker files are stored /P=1 | The default compression tuning (fastest | speed with standard compression) /EMS | Puts the Stacker cache in expanded memory C:\STACVOL.DSK,SW | The location of the Stacker drive; SW | swaps the drive letters After this file is processed, drive C holds the compressed data and drive D holds uncompressed data and the STACVOL file. 2.7 Example for Multiple Stacker Drives Suppose a computer has two fixed disks. You create these Stacker drives: - One Stacker drive compresses all the data on drive C. - One Stacker drive compresses data on drive D, leaving about 40 MB free space. - One Stacker drive uses the free space left on D. - One Stacker drive in floppy drive B - A Stacker RAM drive. You expect to use drive A with manually mounted Stacker drives. The STACKER.INI file might contain these lines: /DIR=C:\STACKER\ | Where Stacker files are stored /P=5 | Compression tuning (more compression | and a bit less speed) /EMS | Puts the Stacker cache in expanded memory /RP=1 | One removable drive (for A) /BD=H | Starts assigning new letters at H | (inserted by DoubleSpace conversion) B:\STACVOL.DSK,RP | Specifies automount for drive B, replaced C:\STACVOL.DSK,SW | Stacker drive on C, swapped D:\STACVOL.DSK,SW | Stacker drive on D, swapped D:\STACVOL.000,NS | Second Stacker drive on D, not swapped E:\STACVOL.DSK,RP | Stacker RAM drive, replaced After STACKER.INI is processed, these are the drive letter: C Stacker drive D Stacker drive created first on E (from existing data) E Stacker RAM drive F DOES NOT EXIST G DOES NOT EXIST H Uncompressed drive containing the STACVOL file for Stacker drive C I Uncompressed drive containing STACVOL files for Stacker drives D and E J Stacker drive created second on E (from free space) Typing STACKER at the DOS prompt gets this result: Drive A: was Drive A: at boot time Drive B: was Drive B: at boot time [Auto-mounting Stacker drive] Drive C: was Drive C: at boot time [H:\STACVOL.DSK = size] Drive D: was Drive D: at boot time [I:\STACVOL.DSK = size] Drive E: was Drive E: at boot time [E:\STACVOL.DSK = size] Drive F: was Drive F: at boot time Drive G: was Drive G: at boot time Drive H: was Drive H: at boot time Drive I: was Drive I: at boot time Drive J: was Drive J: at boot time [I:\STACVOL.000 = size] 3.0 Converting DoubleSpace Disks Outside of Setup Stacker 3.1 Setup automatically converts any mounted DoubleSpace drives to Stacker drives. It does not convert any removable disks or any DoubleSpace drives on the fixed disk that are not mounted. You can use the DCONVERT command outside of Setup to convert DoubleSpace removable disks or unmounted DoubleSpace disks to Stacker drives. The process is the same for both. You must run DCONVERT under DOS, rather than under Windows. IMPORTANT: IF YOU USE DCONVERT, LET IT RUN TO COMPLETION. DO NOT INTERRUPT THE PROCESS. 3.1 DCONVERT Syntax DCONVERT /C dblspace-volume-name [/M] or DCONVERT /G dblspace-volume-name stacker-volume-name [/M] /C dblspace-volume-name Converts the named DoubleSpace volume to a Stacker drive. If you don't include a drive letter in the path, a file of that name on the current drive is converted. /G dblspace-volume-name stacker-volume-name Generates a new Stacker volume by copying the named DoubleSpace volume to a new Stacker volume. It doesn't change the existing DoubleSpace volume. If you omit the drive letter in either volume-name, the current disk is used. /M For use on a monochrome monitor. Use /C to convert a DoubleSpace volume into a Stacker volume. Run CHKDSK on the uncompressed drive before converting the DoubleSpace volume. Use /G to copy a DoubleSpace volume, then convert the copy. DCONVERT needs some working space on a disk to convert it, as much as 1 MB depending on the situation. If it runs out of space, you'll see a WRITE ERROR. There is no problem. Just use /G instead to make a converted copy of the DBLSPACE file on a different disk. Then use COPY to transfer the resulting STACVOL file if you want it on a removable disk. 3.2 Converting an Unmounted DoubleSpace Drive Suppose DoubleSpace drive D was unmounted when you ran Stacker. Setup. Setup won't convert it automatically. Drive D contains the hidden file DBLSPACE.000; use DIR drive: /AH to list hidden files on any drive. To convert the drive, type: DCONVERT /C D:\DBLSPACE.000 The file is converted and renamed to STACVOL.DSK. DCONVERT does not mount the drive, however. 3.2.1 Mounting a Stacker Drive Temporarily To mount a Stacker drive, type STACKER drive:, where drive is the disk that contains the STACVOL file. When you restart your computer, this drive will be unmounted again. 3.2.2 Mounting a Stacker Drive Permanently DCONVERT does not modify the STACKER.INI file when it is run outside of Setup. To cause a converted drive to be mounted when you restart your system, edit the STACKER.INI file as described in section 2.5 and add a drive specification line. For the example in 3.2, you would type on a new line: D:\STACVOL.DSK,SW When you restart your computer, the drive is mounted along with any other drives specified in STACKER.INI. 3.3 Converting a Removable Disk Compressed with DoubleSpace Insert the disk into a drive and type DIR drive: /AH to identify the name of the hidden DoubleSpace volume. Then type: DCONVERT /C drive:\dblspace-volume-name The volume is converted and renamed to STACVOL.xxx. 3.3.1 Mounting Removable Drives The first time you use Stacker Setup to create a Stacker drive in a removable drive, Setup specifies that drive in STACKER.INI so that Stacker drives in it are mounted automatically. If you don't intend to create Stacker drives in a removable drive, you can use the techniques in 3.2.1 or 3.2.2 to mount your Stacker drives. 3.3.2 Allowing for More Removable Drives By default, Setup allows for one removable drive, which includes RAM drives. If you expect to use more, edit the STACKER.INI file (section 2.5) and add /RP=n, where n is the number of removable drives you want allowed. If you include a drive specification (such as B:\STACVOL.DSK,RP) in the STACKER.INI file, /RP isn't needed for that drive. 3.4 Interrupted Conversion Once you start DCONVERT, let it continue until it is finished. If the power is interrupted, here is how to recover your data. 1. Restart your computer and mount the disk if necessary. 2. Run CHKDSK. a. If there is no problem, use DIR /AH to check the disk's directory. If a STACVOL file exists and is smaller than the DBLSPACE file, delete the small STACVOL file and run DCONVERT again. b. If there is a cross linkage, CHKDSK can't fix it. Run a disk repair utility to clear it up, which unlinks the STACVOL file. Then delete the STACVOL file and run DCONVERT again. c. If there is size mismatch, let CHKDSK fix it. Then delete the smaller of STACVOL.DSK or DBLSPACE.DSK. If you deleted STACVOL.DSK, run DCONVERT again. If you deleted DBLSPACE.DSK, the volume was converted. 4.0 Files Duplicated on Both Compressed and Uncompressed Drives Stacker requires that certain files be stored in two places, for startup and recovery purposes. The requirements are different for Stacker 3.1 under MS-DOS 6 than for versions of Stacker that don't use preloading. 4.1 Duplication Required by Stacker 3.1 The following files must be stored in the compressed startup drive and its uncompressed startup drive. If you remove any of them, your system may not be able to start or they won't be available if you need technical support. MS-DOS 6 Files Stacker Files -------------- --------------- MSDOS.SYS (hidden) STACKER.COM IO.SYS (hidden) SYSINFO.EXE DBLSPACE.BIN (hidden) CONFIG.EXE COMMAND.COM CHECK.EXE ATTRIB.EXE CHKDSK.EXE 4.2 Duplication Not Required After Upgrading From an Earlier Stacker Under Stacker 2.0 and Stacker 3.0 for Windows & DOS, all files referred to in the CONFIG.SYS and AUTOEXEC.BAT files were stored on both the compressed and uncompressed startup drives. Stacker kept the files synchronized to make sure they were the same in both locations. This ensured that DOS could find the files it needed during startup. Upgrading to Stacker 3.1 and MS-DOS 6 preloading means that any drive letter switching is finished by the time DOS processes the CONFIG.SYS and AUTOEXEC.BAT files, so any files can be stored only on the compressed drive. If you wish to conserve space on your uncompressed startup drive, you can delete those files. Don't remove them from the compressed startup drive (C). 5.0 Doubling the Capacity of RAM Drives RAM drives are created in the CONFIG.SYS file. To automatically double the capacity of a RAM drive, you can include an SCREATE.SYS device statement following the line that creates the RAM drive. This example creates a 4 MB RAM drive and doubles its capacity: DEVICE=C:\DOS\RAMDRIVE.SYS 4086 /A DEVICE=C:\STACKER\SCREATE.SYS E: The SCREATE.SYS driver command must include the drive letter of the RAM drive. SCREATE doesn't remain in memory. You can mount the RAM drive in any of the usual ways. If your RAM drive is H: edit STACKER.INI and add E:\STACVOL.DSK,RP for automatic mounting. If you have enough removable drives allocated, you can include STACKER E: in the AUTOEXEC.BAT file or type STACKER E: at the DOS prompt. NOTE: If the SCREATE line follows the line that loads STACHIGH, Stacker can't mount a RAM drive from STACKER.INI. You'll have to mount it manually with STACKER drive:. To let STACKER.INI mount the RAM drive, edit your CONFIG.SYS file and move the lines that create and double the RAM drive to a position before the line that loads STACHIGH. 6.0 Using Stacker for OS/2 & DOS 6.0 and Stacker 3.1 If you use these two versions of Stacker, you have to be careful to use Stacker commands from the appropriate version to perform certain functions. Check the README file for Stacker for OS/2 & DOS for all the details. 7.0 MS-DOS Command Equivalents If you type a compression-related DOS command for a Stacker drive, Stacker's command is automatically run. You don't have to remember both the DOS and Stacker commands. The equivalent commands are listed below. DOS Command Stacker Equivalent ------------- --------------------- CHKDSK (and all parameters) CHECK (and same parameters) DBLSPACE/CHK CHECK DBLSPACE/DEF SDEFRAG DBLSPACE/LIST STACKER DBLSPACE/MO drive: STACKER drive: DBLSPACE/U drive: STACKER -drive: DIR/C SDIR DIR/C/P SDIR/P DIR/C/H SDIR/H DIR/C/W SDIR/W DEFRAG SDEFRAG DEFRAG/F SDEFRAG DEFRAG/U SDEFRAG/Q DEFRAG/B SDEFRAG DEFRAG/SN SDEFRAG/SN DEFRAG/SE SDEFRAG/SE DEFRAG/SD SDEFRAG/SD DEFRAG/SS SDEFRAG/SS DEFRAG/LCD SDEFRAG/M DEFRAG/BW SDEFRAG/M DEFRAG/CO SDEFRAG DEFRAG/SKIPHIGH SDEFRAG FORMAT/S Copies the Stacker-modified DBLSPACE.BIN to the formatted disk. SYS Copies the Stacker-modified DBLSPACE.BIN to the formatted disk. 8.0 Upgrading Stacker 3.1 on a Startup Disk That is Mounted Replaced Your startup disk must not be mounted replaced; that is, it must have an uncompressed drive that uses a different drive letter. The Stacker files cannot be stored on a disk that is mounted replaced. If the files are stored on a Stacker drive, Stacker Setup assumes that it is not mounted replaced. If you try to upgrade Stacker on a startup disk, that is mounted replaced, a message lets you know about the problem. Press F1 at that point to get full details on correcting the problem. 9.0 Compatibility Issues A few hardware and software setups interfere with MS-DOS 6 and Stacker functioning. 9.1 Using Anti-Virus Programs DURING SETUP Many anti-virus programs interfere with Stacker Setup. Before you run Stacker Setup, disable or unload any anti-virus programs. If you let Setup restart your computer, it disables all TSRs and restores them at the end of Setup. DURING UNSTACK AND RECOMPRESSING You'll also have to disable the anti-virus programs if you use UNSTACK or if you use SDEFRAG to recompress all the data on a disk. FAILURE TO LOAD Norton AntiVirus from Norton Desktop for Windows 2.2 fails to load if all the following conditions occur together: - 386-MAX version 6.02 is in use (but not 6.01 or 6.03) - STACHIGH.SYS is loaded high using 386MAX's 386LOAD.SYS program (not using DOS's DEVICEHIGH) - NAV&.SYS is loaded after STACHIGH.SYS The easiest way to make NAV&.SYS load is to use DEVICEHIGH instead of 386LOAD.SYS. 9.2 Using NetX with Stacker 3.1 (Novell Networks) As installed, Stacker's redirection of DOS compression related commands to their Stacker equivalents is not effective when NetX is running. To make it effective, turn off the inter ceptor by adding /I- to your STACKER.INI file. Then add Stacker's REDIRECT command (it has no options) to the end of your AUTOEXEC.BAT file. If you prefer not to run REDIRECT, use the Stacker commands when needed. For example, use SDEFRAG rather than DEFRAG to optimize a Stacker drive. 9.3 Using the Adaptec SCSI Disk Controller with Stacker 3.1 and DOS 6 If you are using an Adaptec 154x bus-mastering SCSI disk controller, be sure that Adaptec's ASPI (Advanced SCSI Programming Interface) manager is properly installed on your system. Install the ASPI DOS managers as well to help DOS communicate with the SCSI host adapter more effectively and allow additional SCSI devices. You'll need the ASPI DOS managers also: - To support programs that use virtual memory (such as Microsoft Windows 3.0 and 3.1, QEMM 386 and Qualitas 386MAX) - To support programs that write large amounts of data directly to video memory (AHA-1540, 1542, and 1640 host adapters only) - When more than two hard disk drives are already installed - To install a SCSI drive that is configured at a SCSI ID other than 0 or 1 - To install removable media such as a CD-ROM or tape backup drive For example, If you are using a AHA 1542/B, or 1542/C controller, the following lines should be included in your CONFIG.SYS file: FILES=40 BUFFERS=20 DEVICE=C:\DOS\HIMEM.SYS DOS=HIGH,UMB DEVICE=C:\DOS\EMM386.EXE NOEMS DEVICE=C:\ADAPTEC\ASPI4DOS.SYS NOTE: Adaptec does not recommend loading the ASPI4DOS manager high with the 154x/B card, but that is possible with the 1542/C model. See your Adaptec Software manual for further details regarding proper installation this and other ASPI DOS manager software. Under certain conditions, use of an Adaptec controller with a Stacker drive can make it appear as though your disk contains no data even though the root directory is preserved. Your data is intact. Stacker can work with the Adaptec controller if one of the following is true: - The /EMS switch is not used in STACKER.INI - Double buffering is used - ASPI4 DOS 6 is installed 9.4 Using Norton Utilities version 7.00 In most cases, Stacker drives work well with the Norton Utilities. This section details the exceptions. To make a startup disk as suggested on page 4 of the User's Guide Supplement, start with a Norton Rescue disk rather than an MS-DOS 6 startup disk. Follow these steps: 1. Set up Stacker 3.1. 2. Insert your Norton Rescue disk into drive A. 3. At the DOS prompt, type SYS A: and press ENTER to make the disk Stacker-aware. 4. Relabel the disk "Stacker Startup Disk - Norton Rescue" and put it away. Norton Disk Doctor is compatible with disks compressed by Stacker. However, if you have converted a DoubleSpace drive and not yet used SDEFRAG to recompress the data, using Norton Disk Doctor may result in data loss. It's a good idea to recompress your converted drives right away for better compression and to avoid this problem. Norton Safe Format, when used from a Stacker boot drive, does not create a correct boot sector on the floppy disk being formatted, so the disk can't be used for booting. If you want to create bootable floppy disk, use the DOS FORMAT command instead. Make Disk Bootable utility does not copy DBLSPACE.BIN to the floppy disk. If you want to create a bootable floppy disk, use the DOS FORMAT or SYS command.