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SSD Operation vs HDD operation


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8 replies to this topic

#1 Warthog-Fan

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Posted 05 April 2017 - 08:09 PM

I believe that when a file is erased on an HDD, the file is still physically present on the disk, but the space that it is occupying is marked "available" by the disk software. It stays there until some or all of it is overwritten with new data.

 

But how about SSDs? Do they work the same way, or does a file delete actually erase the file's locations in the Solid State memory that makes up the SSD?

 

Thanks.



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#2 Just_One_Question

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Posted 05 April 2017 - 08:11 PM

I think there is no inherent difference between HDDs & SSDs in this regard, but I am not sure, so we'd better wait for a more knowledgeable opinion on this topic. :)

#3 Drillingmachine

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Posted 06 April 2017 - 03:23 AM

SSD is much more complex but basically just deleting file does not wipe file from SSD, data may still exist.

 

Wiping is much easier on HDD as on HDD erase software can directly write over data. On SSD that is much more complex as SSD data is not directly accessible and SSD usually have cache that contain last used data. Many manufacturers offer software for SSD wiping.



#4 hamluis

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Posted 06 April 2017 - 12:05 PM

https://www.google.com/#q=how+to+wipe+an+SSD?

 

Louis



#5 Kilroy

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Posted 06 April 2017 - 01:54 PM

The difference with a Solid State Drive (SSD) is TRIM, also known as garbage collection.  So, a SSD doesn't delete the information, just like a mechanical drive, however TRIM will clear the information so that the space can be reused.

 

The question is are you asking regarding recovering the data or ensuring that it is really deleted?



#6 Warthog-Fan

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Posted 07 April 2017 - 09:01 AM

Kilroy,

 

I was more interested in deleting data. I would expect that if using an HDD that the best way to clean it up is to use a program like Eraser to delete all of the "erased" data, and then to defragment the drive.

 

So if the SSD actually were to delete "erased" data, then all I would need to do is to defrag it, assuming of course that defragging should be done on one of these drives. Windows gives the option to defrag the SSD, but Windows only sees it as a drive, not necessarily a SSD.



#7 hamluis

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Posted 07 April 2017 - 09:16 AM

Should I Defrag My SSD?

 

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#8 Kilroy

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Posted 07 April 2017 - 12:48 PM

Warthog-Fan, there isn't a good way to delete erased data on a SSD.  On the other hand getting data back from a SSD is also harder.  Kroll gave a presentation that I attended a few years ago, each SSD manufacture writes the data in their own way and Kroll has had to reverse engineer each to develop their own tools to recover data.

 

If security is your concern you might want to look into full drive encryption, but that comes with a whole new set of headaches.



#9 Warthog-Fan

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Posted 07 April 2017 - 03:12 PM

You'd think that with the amount of time that SSDs have been around that their manufacturers would have provided some utilities to clean up the drives and to make recovery of data easier.

 

I originally asked this question to get some general information about SSDs versus HDDs. I don't have a specific issue right now, but I was just looking to learn some things about SSDs so that if I DO have an issue in the future I won't be starting with zero knowledge.

 

Thanks to everyone for their inputs.






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