On Mon, Jul 26, 2021 at 6:02 AM Peter Corlett via cctalk
wrote:
> The Amiga could get 880kiB on a DD disk, and 1760kiB on a HD disk if you have
> one of those hen's teeth drives which spin at 150RPM. It does this by doing a
> read-modify-reformat of the entire track of 11 or 22 sectors, which allo
On 7/26/21 9:44 AM, Fred Cisin via cctalk wrote:
> On Mon, 26 Jul 2021, Peter Corlett via cctalk wrote:
> "inter sector gaps", "write splice", etc. not "guard bands" any "bands"
> (synonym for circle) would be between tracks.
>
> But, VERY good important point that you bring up.
> If a disk will
On Mon, 26 Jul 2021, Peter Corlett via cctalk wrote:
HD disks can hold "up to" 2MB (12,500 bytes per track, times two sides, times 80
tracks), as printed on some of the more misleadingly-labelled brands. However,
splitting that into sectors and adding guard bands reduces the usable space.
Similar
The bottom line on floppy disks, in my view, is that they're a design
compromise out of late 1960s technology.
The platform (drive) is made to be inexpensive (for the time), as is the
media--all limited by, at best, early 1970s technology. Back then,
almost all drive spindles were belt-driven and
On Mon, 26 Jul 2021, Peter Corlett wrote:
When writing, PC-style disk controllers scan for the appropriate sector
header then switch to write mode to overwrite the old sector data. This
requires guard bands between sectors and sector headers. The PC's
This is not called a guard band. A guard b
On Sun, Jul 25, 2021 at 11:46:17AM -0600, Grant Taylor via cctalk wrote:
> On 7/24/21 10:26 PM, Chuck Guzis via cctalk wrote:
>> My recollection of the DMF Microsoft period was that if you purchased a
>> retail MS product using the DMF format and couldn't get it read on your
>> system, a call to MS
My recollection of the DMF Microsoft period was that if you purchased a
retail MS product using the DMF format and couldn't get it read on your
system, a call to MS would result in a standard format copy being shipped.
On Sun, 25 Jul 2021, Grant Taylor via cctalk wrote:
It's my understanding th
On 7/24/21 10:26 PM, Chuck Guzis via cctalk wrote:
My recollection of the DMF Microsoft period was that if you purchased
a retail MS product using the DMF format and couldn't get it read
on your system, a call to MS would result in a standard format copy
being shipped.
It's my understanding t
My recollection of the DMF Microsoft period was that if you purchased a
retail MS product using the DMF format and couldn't get it read on your
system, a call to MS would result in a standard format copy being shipped.
If I look at the source for CopyQM, I note that in the later versions, I
do det
On 7/23/21 18:35, Grant Taylor via cctalk wrote:
On 7/23/21 2:11 PM, Fred Cisin via cctalk wrote:
Some further questions BELOW to complete the distribution media database:
}:-)
1) Which ones were available on 5.25"? (and how many disks?)
A) "360K"?
B) "1.2M"?
C) "1.4M"?
Some further questions BELOW to complete the distribution media database:
}:-)
1) Which ones were available on 5.25"??? (and how many disks?)
A) "360K"?
B) "1.2M"?
C) "1.4M"?
D) Microsoft non-standard crammed 3.5" HD? (1.7M?)
On Fri, 23 Jul 2021, Grant Ta
On 7/23/21 2:11 PM, Fred Cisin via cctalk wrote:
Some further questions BELOW to complete the distribution media database:
}:-)
1) Which ones were available on 5.25"? (and how many disks?)
A) "360K"?
B) "1.2M"?
C) "1.4M"?
D) Microsoft non-standard crammed 3.5" HD? (1.7M?)
Some further questions BELOW to complete the distribution media database:
If memory serves, that mass of floppies was dwarfed by Windows 95,
particularly later versions.
On Fri, 23 Jul 2021, Liam Proven via cctalk wrote:
Win95: 13 disks.
Win98: 38 disks.
Netware 3.1: can't remember... lots:
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