Samsung PM830 SSD

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ColbyBouma

Well-known member
Dec 26, 2020
189
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I got some interesting results from an old SSD I bought as part of an eBay lot a while back. I ran these tests in an old HP DM1Z laptop (AMD E-350 CPU). I used ReadSpeed release 1.

Run #1 shows some lower than expected numbers (compared to a new drive), and inconsistency between regions.
Run #2 is after I ran SpinRite 6.0 at level 2. I see no difference, except at the 75% region, where there is a notable improvement. SpinRite fixed an area that had dropped down to ~100 MB/s (visible in the 75% region of DM1Z-1-1.TXT).
Run #3 is after a secure erase. The numbers look great here.
Run #4 is after using Nwipe (Parted Magic) to write random data to the entire drive (no blanking pass). I'm surprised that this undid the improvement I saw in the 3rd run.

Run0%25%50%75%100%
1​
484.3​
460.4​
481.1​
439.8​
482.0​
2​
484.0​
460.9​
481.1​
483.2​
481.8​
3​
513.6​
515.2​
515.2​
515.2​
515.2​
4​
468.5​
480.9​
480.9​
480.9​
417.9​

I have attached the log files for each run. -0 is a normal run with no parameters other than the filename, and -1 is a run that includes /1. The -1 runs were performed immediately after the -0 runs. The timestamps are wrong because I had to pull the battery to install the drive.
 

Attachments

  • DM1Z-1-0.TXT
    790 bytes · Views: 307
  • DM1Z-1-1.TXT
    5.9 KB · Views: 306
  • DM1Z-2-0.TXT
    790 bytes · Views: 323
  • DM1Z-2-1.TXT
    5.9 KB · Views: 322
  • DM1Z-3-0.TXT
    790 bytes · Views: 304
  • DM1Z-3-1.TXT
    5.9 KB · Views: 308
  • DM1Z-4-0.TXT
    790 bytes · Views: 308
  • DM1Z-4-1.TXT
    5.9 KB · Views: 303
Last edited:
So a secure erase on a SSD with the proper tool, will simply apply enough power to zap all the cells at once. It would also erase any internal tracking. Perhaps the firmware in this drive responds with a "magical" empty sector when prompted to read something it knows is blank (i.e. it is about as fast as the firmware and interface to the CPU will allow.) There is a lot of magic in SSD firmware that is unknown and will lead to situations that seem odd but would probably make sense if we actually knew the inner workings.
 
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