Seagate motor question

[N.C.]

Hi Friend,
After getting proper donor drive and after the proper replacement of platters we cant get any vibrations as we replace the platters with good donor drive as in droped hard drive case the spindle motor is having vibrations and humming noise but not in good one with proper donor drive selection ...
But please describe as thats good answer with simple problem and the rectification as you describe..

Disagree.
There is a "gap" between the motor and the platter for thermal growings.
If you aligh the platter for one side only the platter assembly can do vibration on a good motor as well.

The track-finding is the positining system's ...
As we want to increase our knowledge with this system ..

I have missed one "o", sorry.

Janos

[withyou]

Hi Friend,
After getting proper donor drive and after the proper replacement of platters we cant get any vibrations as we replace the platters with good donor drive as in droped hard drive case the spindle motor is having vibrations and humming noise but not in good one with proper donor drive selection ...
But please describe as thats good answer with simple problem and the rectification as you describe..

Disagree.
There is a "gap" between the motor and the platter for thermal growings.
If you aligh the platter for one side only the platter assembly can do vibration on a good motor as well.

The track-finding is the positining system's ...
As we want to increase our knowledge with this system ..

I have missed one "o", sorry.

Janos

Hi Friend ,
Thats good to discuss and distribute as a healthy answer..
1) After scrwed the platters with the good spindle motor /good donor drive than thats not the issue for this type of problem about vibrations and all ,try with some scrap hard drive and in screwing of the platters with spindle motor there is no allignment things inbeetween succeful transplation and scrwed with spindle motor or please describe the thermals and all inbeetween platter and spindle motor..
2) Spindle motor is fixed with chasis of the hard drive. as we transplant the platters in good donor drive..
As i think we have to grow our knowledge with track finding positioning system of platters ,so i just ask about this system and thats the good question for us ...

[N.C.]

In this model, the PS can handle the minor eccentricity, but not like the big after unaligned platter swap.
The density is big, and the gap is bigger than the track, this is why we need to center again the platters after platter swap.
With a goot quality platter extractor tool, this is not a big problem anyway.

[withyou]

In this model, the PS can handle the minor eccentricity, but not like the big after unaligned platter swap.
The density is big, and the gap is bigger than the track, this is why we need to center again the platters after platter swap.
With a goot quality platter extractor tool, this is not a big problem anyway.

Hi Friend,
How we can define that The density is big, and the gap is bigger than the track and we are intrested to learn this technology to how to check and meassure about this gap and rectify this type of simple problem as you just described in very simple /very much technical /confusing way, as we want to know and increase our knowledgebase to check the density /track or what you described that just check the tracks so please described as regarding the DVD manufacturing for this process if the tracks are good or bad my friends just answer we just check ...or destroy the whole lot..so i just want to share the knowledge...and how you /we measure the tracks ?As the instruments are here to check but thats the diffrent technology to adopt..including very bigger /higher investment so we here to best of knowledge or please send the answers in better way as we regrds for better answers ..with proper technical answers as we wish or we are here to misguide the things /persons?

[N.C.]

@withyou

If you are really working in dr fields, you should know, how works the positioning system, who many mm/nm is one track and how to calculate the gap from the material types and measurements.

For tracks, i have 3 options:
1. i can read out the number of phisical tracks with PC3K and i can divide the platter's radius with the number.
This is not too precise, but much more precise enough for compare with the gap.
2. i can read carefully the VCD's documentation, and do some calculation in mechanic.
3. - this is an unique option for me - I can measure the head's movements with my own designed laser measurer tool.

For the gap: if you remove the screw from the axis, and starts to move the platter form left to right and back, you should see the gap, and because you can see it, this is HUGE compared to the track.
Andditionally there are some micrometers, some distance measurer tools and similar for measure precisely the gap, you should know this....

Do you still have questions?

Janos

[BlackST]

And you'll give some answer? LOL

[Hexed]

Well I didn't work on making a tool and technique for swapping platters and hub as one assembly over the weekend. I went camping with my wife instead. Today I managed to remove enough of the eccentricity for the drive to initialize and it is now imaging slow but pretty good so far.

[withyou]

@withyou

If you are really working in dr fields, you should know, how works the positioning system, who many mm/nm is one track and how to calculate the gap from the material types and measurements.

For tracks, i have 3 options:
1. i can read out the number of phisical tracks with PC3K and i can divide the platter's radius with the number.
This is not too precise, but much more precise enough for compare with the gap.
2. i can read carefully the VCD's documentation, and do some calculation in mechanic.
3. - this is an unique option for me - I can measure the head's movements with my own designed laser measurer tool.
For the gap: if you remove the screw from the axis, and starts to move the platter form left to right and back, you should see the gap, and because you can see it, this is HUGE compared to the track.
Andditionally there are some micrometers, some distance measurer tools and similar for measure precisely the gap, you should know this....

Do you still have questions?

Janos

Hi Friend,
As thats not the answer with orignal problem but thats good to answer in positive way as you described but as there is lot of ,if and buts in this forum please describe your
3. - this is an unique option for me - I can measure the head's movements with my own designed laser measurer tool.
As thats the answer misguide by you so please guide your fruitful answers not an IMAGINATIVE answers..

[Hexed]

Just figured I would write about how this one turned out. It's been a while. The first time I got the motor spinning and finally got the drive imaging, I only got about 35% imaged when the bearing seized again. It was quite a loud bang when it failed too. What I know now but did not know then was that the loud bang was the failed drive went flying into the destination drive and caused a bunch of head slaps on it. No sense in trying to free bearing again so I buy a matching part drive. Turns out there are not a lot of these available so it cost me quite a bit. I do the platter transplant and put in heads from the failed/client drive. The drive initialized with no problems but I was having all kinds of weird problems trying to pick up imaging where I left off. I assumed it was due to the patient drive being unstable. Put in heads from donor drive, same weird stuff. I take a look at my partial image to see what I have so far and that's when I discovered that the destination drive had many areas it would not read. So I image the partial image to another good drive. Manually update the original image map to reimage the areas I could not get from the original destination drive. Back to imaging the patient drive and all is going well. Got about 62% imaged and drive became unstable. Then one of the heads died. Put in the original patient heads and started imaging backwards. I stopped imaging 100K sectors before the heads got to where they died before. Looked at image and found no data located in that area anyways. Ended up with 800 bad sectors plus the 100K sector hole. Recovered 100% of files with 17 of them damaged with bad sectors. Happy client except he still is annoyed because he was told this recovery should have only cost $600.00.