FB 357A slow read with DD floppies

whaka · 03 May 2021, 10:21

Hi,

is the FB 357A slow too when working with DD floppies ?
i mean, the motor speed is good, you can see the difference between DD and HD, but despite the fact the motor run at 300 rpm, when scanning content of floppy... it's slow as with HD floppy.
is that normal for this particular model, or is it an issue ?

i noticied that, because i get a "joblot" of floppy drives recently, and they're all near twice as fast when scanning content. and they're all DD only.

this 357A is the original drive of my 3000.

thanks.

hooverphonique · 03 May 2021, 10:23

You mean head stepping? There's no feedback on that, so as long as it works, it is fast enough, and making it faster doesn't make any difference as the OS uses a fixed delay between steps.

If it "scans" across the disk more than other drives (using the same disk), there may be an issue causing read errors so it has to retry - that will of course make it slower.

whaka · 03 May 2021, 10:47

yes, i mean head stepping. really far slower than others drives i have.
i'm also sure of his head alignement. but he seems to act like if it work with HD floppy.

cpiac64 · 03 May 2021, 22:26

verify the sensor of hd

solarmon · 03 May 2021, 23:02

Use Amiga Test Kit to check the disk signals and to perform read and alignment tests on it.

whaka · 04 May 2021, 09:27

i forgot to mention, it was with fat formatted floppies. i redo testing with ffs/ofs formatted floppies, and it work normally.
that's a bit weird, as others are faster with fat.
the HD switch work as expected, and i'm sure of head alignement.

but i'll try with amiga test kit, i didn't know it... let's see

03 May 2021, 10:21	#1
whaka Registered User Join Date: Jan 2017 Location: France Posts: 102	FB 357A slow read with DD floppies Hi, is the FB 357A slow too when working with DD floppies ? i mean, the motor speed is good, you can see the difference between DD and HD, but despite the fact the motor run at 300 rpm, when scanning content of floppy... it's slow as with HD floppy. is that normal for this particular model, or is it an issue ? i noticied that, because i get a "joblot" of floppy drives recently, and they're all near twice as fast when scanning content. and they're all DD only. this 357A is the original drive of my 3000. thanks.

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03 May 2021, 10:23	#2
hooverphonique ex. demoscener "Bigmama" Join Date: Jun 2012 Location: Fyn / Denmark Posts: 1,624	You mean head stepping? There's no feedback on that, so as long as it works, it is fast enough, and making it faster doesn't make any difference as the OS uses a fixed delay between steps. If it "scans" across the disk more than other drives (using the same disk), there may be an issue causing read errors so it has to retry - that will of course make it slower.

03 May 2021, 10:47	#3
whaka Registered User Join Date: Jan 2017 Location: France Posts: 102	yes, i mean head stepping. really far slower than others drives i have. i'm also sure of his head alignement. but he seems to act like if it work with HD floppy.

03 May 2021, 22:26	#4
cpiac64 Registered User Join Date: Apr 2010 Location: Italy Posts: 1,136	verify the sensor of hd

03 May 2021, 23:02	#5
solarmon Registered User Join Date: Dec 2018 Location: UK Posts: 1,715	Use Amiga Test Kit to check the disk signals and to perform read and alignment tests on it.

04 May 2021, 09:27	#6
whaka Registered User Join Date: Jan 2017 Location: France Posts: 102	i forgot to mention, it was with fat formatted floppies. i redo testing with ffs/ofs formatted floppies, and it work normally. that's a bit weird, as others are faster with fat. the HD switch work as expected, and i'm sure of head alignement. but i'll try with amiga test kit, i didn't know it... let's see

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