"Cleaned" Apple 800k floppy drive from Macintosh SE still problematic

[fergycool]

I cleaned and re-lubricated the 800k drive from my Macintosh SE. I followed this guide on YouTube.
Before I cleaned the drive it very rarely read a floppy. After cleaning I can read most floppies and I've been able to write 800k install images that I could not before.
But I have two problems still.

- Even though it's been able to write an image it fails 100% to initialise a disk.
- Even with the PC Exchange control panel it will not read any PC Formatted drive.

The SE is running 7.1. All the disks that are problematic are 100% readable and writable on a Superdrive on a Quadra 610.
For the first issue is is that I've just not cleaned it enough? Would doing it a second time improve my chances?
For the second issue is it just that these 800k drives are incapable of reading PC formatted DSDD disks?
Thank you!

 

[fergycool]

I would also add that dsdd disks formatted as 800k on the Quadra can be used fine on the SE.

 

[cheesestraws]

- Even though it's been able to write an image it fails 100% to initialise a disk.

At what point does it fail? At the beginning or at the end? What happens if you try to write a DiskCopy image? Can you *make* a diskcopy image of a full floppy? I wonder if the head is failing to get to the very end of the disc or something...

For the second issue is it just that these 800k drives are incapable of reading PC formatted DSDD disks?

You need a 1.44MB drive and a SWIM to read any PC-formatted floppy. The way the data is physically laid out on the floppy is different, and the older drives and controllers cannot deal with that.

 

[fergycool]

At what point does it fail? At the beginning or at the end? What happens if you try to write a DiskCopy image? Can you *make* a diskcopy image of a full floppy? I wonder if the head is failing to get to the very end of the disc or something...

It fails almost immediately.

But when writing a DiskCopy image (using DiskCopy 6.2.2) everything goes fine every time and the ejected disk mounts fine when popped back in.

You need a 1.44MB drive and a SWIM to read any PC-formatted floppy. The way the data is physically laid out on the floppy is different, and the older drives and controllers cannot deal with that.

Thanks. That's clear.

 

[fergycool]

Ahh. I'm such a numpty. The drive is fine! The problem was the extension that runs my "christmas present to me" MacEffects/Bolle Performer accelerator card! I've only just installed this card otherwise I would have mentioned it when I posted this. However, I added the extension some weeks ago when I orderd the card. On reading this review of the card they also see the same issue. Disabling the Instruction Cache, initialising the disk, then reenabling the Instruction Cache resolves the issue! Sorry!

 

[cheesestraws]

The problem was the extension that runs my "christmas present to me" MacEffects/Bolle Performer accelerator card!

Oh, that would make sense. A lot of accelerators seem to have to do Dark Magic™ to get floppy timings etc right, and I'm never surprised when there are edge cases when they fail.

(And apologies for disappearing, I meant to answer your previous post, though not with anything very useful, but I managed to lose the thread somehow...)