Toshiba MK5056GSY HDD2E61 F VL01 T 500GB Sata 2.5

[Haltec]

Hi.


Video(s):

http://goo.gl/jTztg

http://goo.gl/A660x


Enclosered (operating at that moment) device felt of 50cm height.


Heads looks ok - altough I didn't inspect them under microscope - to dusty in workshop.

Some weird white residue on outer (top) platter edge - like from plastic parkzone? (White also)


Any how - I have a sutable working donor, but I would like it to preserve that condition.

How to check platter underside on 2.5?

Both upper and lower.

Are those 2 platters somehow dinamically or statically balaced in axial asis?


Some pics:

Tis is some unrelated pic of head from different drive...

How do you even inspect head since if holder is intact you can inspect it only sideways.

Haltec

[Haltec]

And this is videos uploaded on youtube:


http://youtu.be/bslB1aAsLQ0


http://youtu.be/yEPU7bquVM4


Haltec

[labtech]

Your drive likely fell while powered on. Ouch! Not good. And then additional power cycles. Made matter worse.

viewtopic.php?f=16&t=7457

viewforum.php?f=16

Sorry

[Haltec]

Ok. Thx.


Can ANYONE here from sounded videos, made an estimate - not a future prediction, regarding the following:

1. IS/ARE PLATTER(S) DAMAGED?
2. WHAT IS MAKING THAT SQUILLING NOISE?




Haltec

[labtech]

Could be many things, one thing or combination of things.

One example is that the edge of the platter is rubbing against the parking ramp.
Another is the head screw holding the heads in place from the top of the lid. That's there for a reason.

[Haltec]

None of above.


But I went to my microscope, and I'll put some pictures later on when get home since I am on my cell now.

This on the platter edge is somehow clear transparent plastic. Allready having suspect. But it will be easier to explain when pictures are along.

There is no posibillity whatsoever that that is head ramp part, regarding internal construction along with its tolerances.

To achieve ramp colision with platter, whole casing should be bended due to impact force causing it.


Haltec

[mr_spokk]

There is no posibillity whatsoever that that is head ramp part, regarding internal construction along with its tolerances.

You sure!?!..what if the heads smashed into the ramp when it fell down, and got stucked between platter and ramp and then powered on several times? I've seen it many times.

[labtech]

Rotate the platters manually [careful not to damage the platters] and look at the height of the platter in reference to the ramp. There should be a wobble.
Upon impact the ramp touched the platter.

For your own test, place the lid on and screw in the heads screw, do you still hear the same squalling? I doubt it. Clicks, yes, because the heads are definitely toast.

[Bladerunner]

Platters are perfectly still no any wobble wow or flutter - and there is actually quite nice and easy diy laser way to test.

Altough reflection is problem during taking photos, sometimes is usefull.

I had my thoughts to writeup post about measuring with ball beared Mitutoyo comparator on serveral positions, just to cause some panic.

8241466-11.jpg (5.33 KiB) Viewed 8582 times

Nevertheless - Plastic is soft and transparent - it only appears white(ish) while is laying on platter surface...

And here is the responsible individaual:

It appears like teflon based low friction plastic, but it's still mistery what chipped it...


Most likely I am going to CNC an universal HSA + Head Ramp holder for head migration. Like someone posted here on forum.

Q: On a multiplatter - are platter positions related to Y-axis of any relevance. E.g. If theoretically I could rotate upper platter by slightly loosening motor screw(s) will that re-positioning have any affect on otherwise fully functional drive???




Haltec

[labtech]

A: Generally speaking, yes. Needless to say, never allow that to happen. Despite this, Toshiba drives has a degree of tolerance when it comes to this particular issue.

Other than experimenting, given the additional info provided in your last post, there is no need to mess with the platters at all.

[Haltec]

I would like to inspect platters undersides and upper surface of lower platter...

Since platter diameter is 65.45 mm how much do you think can be shifted in different directions? an 0.50mm? 1.00mm? More ?

Now to avoid calculating radians and angular - By 1.00mm I mean outer edge of platter rotated in any direction.

I really don't like that silicone lookalike on upper platter. And have seen some small residues on lower platter sidewaws edges also.

As long I am looking those heads it seems to me that they are in great condition.

Only one I can't inspect ATM is top one because I would have to remove HSA to turn it upside down.


And when I made HSA tool I'll post detailed head pictures here.

Have you ever tried to scratch one of those under a scope ? Extremely resilient. Don't even know what to compare with this. It's like trying a scratch marble plate with teflon stick of one cm diameter. You can't do any damage with superb sharp scalpel or needle - without really REALLY trying HARD.

And how platters of multiplatter hdd's are cleaned if they have to mandatory be in same angle one to each other?

Is homehow sideways marking of platters possible?


Haltec

[labtech]

Have you ever tried to scratch one of those under a scope ?
Haltec

They scratch my patience a lot as it is all day, so never tried.