"Theo" <
theom...@chiark.greenend.org.uk> wrote in message
news:njh*r8...@news.chiark.greenend.org.uk...
> NY <m...@privacy.invalid> wrote:
>> Why is it bad news that a modern 3.5" diskette drive connects by USB -
>> unless you are planning to boot from it (*), all that matters is that the
>> drive appears as a drive letter (eg A:) to Windows and hence a diskette
>> in
>> the drive can be read / written to. Likewise for other legacy drives such
>> as
>> 5.25" or 8" floppy, or Zip drive. I've seen three different connections
>> for
>> Zip drives over the years: parallel, IDE and USB. (**)
>
> USB floppy drives can't read some disc formats. Floppy is a physical
> layer
> protocol - the controller drives the motors, sensors and raw data stream
> directly. USB floppy drives are block devices that are set up to read PC
> floppies and PC floppies alone, hardcoding those decisions in the drive
> firmware.
Ah, right. I didn't know that. I'd assumed that any USB device had the same
capabilities as a legacy device with some other interface.
I remember having to use special software to make a DOS PC read a 5 1/4"
floppy that had been created by a CP/M 3 computer that I had. I think it was
called 22NICE. I imagine that was to send the relevant control signals to
the motor and head so it could access non-DOS-standard track and sector
count and spacing. I *think* the CP/M disk was 180 KB rather than 360 KB.
Somewhere I still have a 34-pin 3.5" (DD) drive. But I haven't got a PC that
I could connect it to... I suppose it's possible that an old Windows XP
that I keep for its analogue video capture card may have a floppy interface,
though I probably haven't got the correct ribbon cable. Have I even still
got a PC that can read IDE (as opposed to SATA) hard drives, I wonder? (*)
Fortunately AFAIK I copied anything I needed off diskette and ZIP disk to
HDD or CD when I knew my next PC would not have those drives. I wonder if
old copies of Harvard Graphics and Word Perfect (I think the DOS version)
would work on Windows 7 or 10, or even whether the diskettes would still be
readable.
How quickly old technology becomes obsolete...
My latest laptop does not have:
- parallel or RS-232 ports - no sad loss as I don't have my old dot-matrix
printer that used parallel
- separate sockets for mike and line-out (just a 4-pole composite socket);
no line-in capability (**)
- CD/DVD drive
- VGA socket (only HDMI) - no sad loss unless I want to connect an old 14"
flat-screen 1024x768 monitor (do I really need to keep that?)
(*) I know I still have my IDE/SATA to USB interface device for accessing
HDDs outside the PC that they came from.
(**) After a scare with the on-board sound card in a much older laptop, I
bought a USB to mike/line-in/line-out adaptor. That was after I took my
(battery-powered!) laptop into the bathroom to listen to music while I had a
bath, and the steam did something to it. It worked again after it dried out,
but by then I'd bought the external device.