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    I would hazard a guess and say that you have a hardware problem on sda. Not sure why you would believe it is sdb. Commented Dec 2, 2021 at 17:28
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    For starters, don't use dd. I know every tutorial says to use it, but it's pointless at best, counterproductive at worst. Use cat or pv, or more dedicated tools like ddrescue. Commented Dec 3, 2021 at 9:26
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    My first thought was that it could be a counterfeit SSD of 8 Gb sold as a 500 Gb: geckoandfly.com/22803/… Are you sure it contains 500 Gb of data? Commented Dec 3, 2021 at 12:53
  • I had this same issue when using a cheap USB->SATA with broken UASP support. Disabling UASP helped: leo.leung.xyz/wiki/Disable_UAS Commented Dec 5, 2021 at 10:39