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Issue #366

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Based on input from Dean Jenkins:
- Updated User Guide to clarify some nuances related to use of Combo Disk Images
- Added "blank" slice images
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Wayne Warthen
2023-10-04 16:54:34 -07:00
parent 480dbe4f4c
commit 9072bc6d70
15 changed files with 57 additions and 7 deletions
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Source/Doc/UserGuide.md
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@@ -1537,7 +1537,46 @@ indicated:
You will notice that there are actually 2 combo disk images in the
distribution. One for an hd512 disk layout (hd512_combo.img) and one
for an hd1k disk layout (hd1k_combo.img). Simply use the image file that
corresponds to your desired hard disk layout.
corresponds to your desired hard disk layout. Review the information
in [Hard Disk Layouts] if you need more information of the disk layout
options.
The partition table in the combo disk images includes an entry for a
FAT filesystem starting at 512K with a size of 384K. So when using
the combo disk image, by default, your disk will have the first 512K
dedicated to CP/M slices followed by 384K for a FAT filesystem. Note
that the pre-allocated FAT partition must still be formatted using
`FDISK32` in order to actually use it
(see [FAT Filesystem Preparation]).
The combo disk image layout was designed to fit well on a 1GB hard
disk. The 512K of CP/M slices and 384K of FAT filesystem all fit inside
a 1GB hard disk. This size choice was a bit arbitrary, but based on the
idea that a 1GB CF or SD Card is easy and cheap to acquire. It is fine
if your hard disk is smaller than 1GB. It just means that it will not
be possible to use the pre-allocated FAT filesystem partition (you will
get I/O errors if you attempt to do so).
The 512KB area of the combo disk image set aside for slices can contain
approximately 64 slices (8MB per slice). If your actual hard disk is
less than 512KB, then this will correspondingly reduce the number of
possible slices. If your hard disk is smaller than 64MB, then you
will find that some of the higher drive letters do not work because
they exist "off the end" of the hard disk.
For RomWBW systems with a single hard disk (typical), you will notice
that an OS will pre-allocate 8 drive letters to the hard disk. If the
combo disk image is being used, only the first 6 drive letters (A: - H:)
will have any content because the combo disk image only provides 6
slices. The subsequent drives (I: - J:) will have no content and will
not be pre-initialized. If you want to use any slices beyond the first
6, you must initialize them using `CLRDIR` first.
A great way to maintain your own data on a hard disk is to put this
data in slices beyond the first 6. By doing so, you can always
"reimage" your drive with the combo image without overlaying the data
stored in the slices beyond the first 6. Just be very careful to use
the same combo image (hd512 or hd1k) as you used originally.
#### Custom Hard Disk Image