13 Nov
1998
13 Nov
'98
6:28 a.m.
> And dust particles will work like sandpaper and
grind the
> disk surface
Which is why the inside of the disk jacket has
material to sweep up
dust and keep it from the disk surface.
Sometimes this works.
Geez, people, I never claimed that you could dump huge
piles of dust, smoke,
dirt, and sand on the floppy disk and expect it to work for more than five
seconds. My point was that you don't have to be super-careful with them. One
dust particle isn't going to ruin the disk (at least not very quickly). You
don't have to handle floppy media in a cleanroom. However, one dust or smoke
particle *IS* enough to cause a head crash in a Winchester drive.
I have even seen SyJet drives working within a heavy
smokers environment - a friend of mine - he has ashes
all around the desk, the keyboard and everywhere else.
And the dam things are working prety good.
> there are 4 basic technologies for the
head/surface
> management of disk Magnetic:
>
> 1. Fixed head over hard surface
> 2. Flying head over fixed surface (Winchester)
> 3. Fixed head over flexible surface (Bernulli)
> 4. Head grinding over flexible surface (Floppy)
> (also tapes go into #4 but since the head surface
> speed is only slow, the effekt is less visible)
Depends on the kind of tape. Helical scan tape has
this effect
*MORE* than floppy drives, because the head-to-tape speed is much
higher.
:))) to modern in data processing - I'll ignore them.
Any tape with more than 1600 dpi isn't a tape to me :)
> And we are talking about 2 vs. 4 (head flying over
hard
> surface vs. head on flexible surface). The other ones
> have been used in several drive types thru the past. And
> all in encapsulated (seled) and 'free' environment.
That's my point. The Syquest SyJet and Sparq
drives, and the Iomgea
Jaz drive, appear to use what you have listed as configuration 2.
They have to, in order to get .75 to 1.0G density per platter.
Configuration 1 can't get the head close enough to the media. And even
if they did use configuration 1 and get the head close enough to the
media, then it would be just as susceptible to foreign particles as
configuration 2.
They used #2 in the SyJet, since the problems are much
bigger with #1. My experiance with any kind of high
density media is that the process of insert and remove
has to be done in a aprobiate manner. Like back in my
operator times, the insertation of a Disk has just to
be done carefuly and sensitive. And this is still true
for any other modern removable media.
That's precisely why they are so f*&#ing
unreliable.
I just cant agree - I have several running without any
problem. As I mentioned earler, I have almost any drive
ever build from Syquest (and some other manufacturers),
and I'm prety satisfied with Syquests.
The only thin I learned to hate are MO drives. Once I
had a 640 MB Sony drive, and it died 5 times and had to
be replaced 5 times ... Later on I went back to pure
magnetics.
Out of over 30 SyJet and Sparq drives, I don't
think we've had a single
one last more than 100 cartridge insert/eject cycles.
I son't know whats wrong, but I may just have had luck.
Servus
Hasn
--
Ich denke, also bin ich, also gut
HRK