HDDs interference external magnetic fields

[cloudff7]

iMacs have internal HDDs; do they use 2.5" or 3.5" HDDs? Unlike the consumer common older 2.5" HDDs from 2010, iMac HDDs have special shielding, and the iMac CRT also has special shielding so that even with the short distance between them, misalignment doesn't occur, interfering with the correct movement of the read/write heads and causing read and write errors, and also preventing data corruption or erasure on the platters due to the strong electromagnetic waves and fields of the CRT.

[whispous]

Here he is again with the same storage+crt+magnets nonsense seen roughly five billion times, this is getting fun

 

The answers you seek are in your previous threads

[Needfuldoer]

You have already asked this question numerous times. Please refer to your many past threads about hard drives and magnetic fields.

 

Rephrasing your question will not change the answer.

 

On 12/31/2025 at 5:42 AM, cloudff7 said:

Unlike the consumer common older 2.5" HDDs from 2010, iMac HDDs have special shielding, and the iMac CRT also has special shielding so that even with the short distance between them, misalignment doesn't occur, interfering with the correct movement of the read/write heads and causing read and write errors, and also preventing data corruption or erasure on the platters due to the strong electromagnetic waves and fields of the CRT.

None of this is true. There's nothing special about the hard drives in CRT iMacs. They used commodity off the shelf hard drives (usually from Seagate and Maxtor in my experience) with no special shielding or magic.

 

As has been explained multiple times, hard drives just aren't that sensitive to magnetism. Hard drives actually have extremely powerful neodymium magnets inside them. They're what make the head actuation coils work. Their cases are cast aluminum and stamped steel. Speakers and CRT monitors also don't radiate huge magnetic fields, even when their degaussing coils fire.

 

It takes deliberate action with an incredibly powerful rare earth magnet to disrupt a hard drive.

 

 

[SansVarnic]

-= Topics Merged =-

[flibberdipper]

On 12/31/2025 at 6:45 AM, whispous said:

The answers you seek are in your previous threads

I don't think they're gonna read them. Ignoring all the times they just... blatantly ignored what they were being told to reword the question and ask again, this has been going on for almost a full YEAR. The only shit I've ever seen go on for that long are threads that make sense (show off your purchases, show off your setup, etc.) and build logs.

[Blue4130]

13 minutes ago, flibberdipper said:

I don't think they're gonna read them. Ignoring all the times they just... blatantly ignored what they were being told to reword the question and ask again, this has been going on for almost a full YEAR. The only shit I've ever seen go on for that long are threads that make sense (show off your purchases, show off your setup, etc.) and build logs.

And he is not only ignoring advice here, he also posts the same questions on servethehome, Tech power up and other sites. At least he did until he was banned. Though he has made new accounts on at least one other site.

[cloudff7]

thanks friends support

 

So, based on your experience, is it safe to keep 2.5" HDDs (old 2010 or new 2025) turned on and 2cm away from a large 29" CRT TV and a desk fan, both turned on, because the electromagnetic waves from these devices don't interfere with the mechanical operation (heads arms movement errors) and the platters? I thought they were extremely sensitive.

[Blue4130]

7 minutes ago, cloudff7 said:

thanks friends support

 

So, based on your experience, is it safe to keep 2.5" HDDs (old 2010 or new 2025) turned on and 2cm away from a large 29" CRT TV and a desk fan, both turned on, because the electromagnetic waves from these devices don't interfere with the mechanical operation (heads arms movement errors) and the platters? I thought they were extremely sensitive.

Welcome back. How many times are you going to make us answer this question? We already told you. Many, Many times.

[Dedayog]

1 hour ago, Blue4130 said:

Welcome back. How many times are you going to make us answer this question? We already told you. Many, Many times.

No fucking clue how he's not banned yet.

 

I'll get a warning and points for this post alone...  but he can just troll for months.

[cloudff7]

I have a 2.5" HDD + USB enclosure and CrystalDiskInfo shows good health.

I have files on this 2.5" HDD. If I delete some files and copy new files onto the HDD, could the remaining files that I didn’t change be corrupted or lost because of the erasing procedure, copying some files that were on the drive, and adding new files?

For example: I have 300 old files on the 2.5" HDD. I deleted 50 files and added 50 new files. Could some of the remaining 250 files suffer corruption or loss due to the procedure, stressing the platters with the erasing/copying process?Read

[Blue4130]

25 minutes ago, cloudff7 said:

I have a 2.5" HDD + USB enclosure and CrystalDiskInfo shows good health.

I have files on this 2.5" HDD. If I delete some files and copy new files onto the HDD, could the remaining files that I didn’t change be corrupted or lost because of the erasing procedure, copying some files that were on the drive, and adding new files?

For example: I have 300 old files on the 2.5" HDD. I deleted 50 files and added 50 new files. Could some of the remaining 250 files suffer corruption or loss due to the procedure, stressing the platters with the erasing/copying process?Read

No

[Dedayog]

2 hours ago, cloudff7 said:

I have a 2.5" HDD + USB enclosure and CrystalDiskInfo shows good health.

I have files on this 2.5" HDD. If I delete some files and copy new files onto the HDD, could the remaining files that I didn’t change be corrupted or lost because of the erasing procedure, copying some files that were on the drive, and adding new files?

For example: I have 300 old files on the 2.5" HDD. I deleted 50 files and added 50 new files. Could some of the remaining 250 files suffer corruption or loss due to the procedure, stressing the platters with the erasing/copying process?Read

Are you serious?

 

Are you asking if the standard copy and erase process can damage files not even associated with the process?

 

No.  

 

Do the words in your head escape when you say hi to someone?  No.

 

God bless, THINK about things you're asking.

[cloudff7]

I thought that the process of deleting/writing new data on the platters of 2.5" HDDs generated some kind of bad sector that could affect and corrupt old files I kept on the HDD.

[Ryker Robb]

6 minutes ago, cloudff7 said:

I thought that the process of deleting/writing new data on the platters of 2.5" HDDs generated some kind of bad sector that could affect and corrupt old files I kept on the HDD.

what?

[Blue4130]

40 minutes ago, cloudff7 said:

I thought that the process of deleting/writing new data on the platters of 2.5" HDDs generated some kind of bad sector that could affect and corrupt old files I kept on the HDD.

In what world would that make sense? Why would people accept a harddrive that deletes or corrupts data when used as intended?

[cloudff7]

Because HDDs easily develop bad sectors under certain usage and stress conditions, and this corrupts files.

[Pusbucket]

4 minutes ago, cloudff7 said:

Because HDDs easily develop bad sectors under certain usage and stress conditions, and this corrupts files.

no they don't !!!!!!!!!!!!!!!!

 

maybe you should look into a different hobby that isn't so stressfull.

[Blue4130]

5 minutes ago, cloudff7 said:

Because HDDs easily develop bad sectors under certain usage and stress conditions, and this corrupts files.

Writing data as intended is not a stress condition. It is literally designed to do this action.

[Dedayog]

3 hours ago, cloudff7 said:

Because HDDs easily develop bad sectors under certain usage and stress conditions, and this corrupts files.

Where do you hear things like this?  Under certain usage and stress, NOT normal use.  Or do you not think reading and writing files is normal use?  I am curious how you get to your questions.

 

Or is this how your brain goes from A to B to C to D, etc?

 

Google "catastrophic thinking".

 

[cloudff7]

Any explain this situation? Copy delete any filés not develip bad sectors affeted others filés in players generates corrupt data

[Blue4130]

48 minutes ago, cloudff7 said:

Any explain this situation? Copy delete any filés not develip bad sectors affeted others filés in players generates corrupt data

Why would it? The data being written/deleted is on one sector, it won't affect what happens on a different sector.

 

Can you explain WHY you think this will cause corruption?

[Dedayog]

1 hour ago, cloudff7 said:

Any explain this situation? Copy delete any filés not develip bad sectors affeted others filés in players generates corrupt data

We cannot explain that because it doesn't happen during normal operations.  When a drive is failing, then it MAY.  We cannot predict when a drive fails.

 

You cannot test for it as a consumer either.  

 

Interesting though, cuz THIS person....

 

5 hours ago, cloudff7 said:

Because HDDs easily develop bad sectors under certain usage and stress conditions, and this corrupts files.

Did not write THIS post...

 

1 hour ago, cloudff7 said:

Any explain this situation? Copy delete any filés not develip bad sectors affeted others filés in players generates corrupt data

Either we have split personalities or multiple people post under his name.

[Pusbucket]

9 hours ago, Dedayog said:

Either we have split personalities or multiple people post under his name.

or first post is sober, second after a couple few drinks.

[Ryker Robb]

Modern drives do employ shock based write protection, where the drive detects if the heads are off track, due to an external shock or bump, and aborts any write attempt to protect nearby data tracks from being unintentionally written to. This is called write fault detection or off track detection. Is this what you're thinking of?

[cloudff7]

Is there any risk of damage to 2.5" hard drives if stored for many years next to many magnetic screwdriver kits (4 kits complete)? this screwdrivers is magnetic