Some information about HP T620 Plus Flexible Thin Client machines for network appliance builds...

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fohdeesha

Kaini Industries
Nov 20, 2016
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Eh, it's whatever limit AMD Jaguar/A50M Hudson M1 Southbridge has for SATA drives (that's the PCH used by the onboard APU).
when was the last time a PCH/SATA controller had an arbitrary drive limit? the sata/SAS1 2TB limit than stemmed from 32-bit block addressing almost 15 years ago?
 

WANg

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Jun 10, 2018
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when was the last time a PCH/SATA controller had an arbitrary drive limit? the sata/SAS1 2TB limit than stemmed from 32-bit block addressing almost 15 years ago?
Who knows - the APU is nearly 12 years old at this time and it's originally meant for AMD Netbooks so I am sure there's some funky limitation somewhere compared to more modern hardware, like either it's rate limited to SATA2, or there's some CPU cycle hogging issue for DMA, or Spectre mitigation for AMD Jaguar killing their I/O performance. Capacity-wise it's probably not an issue, but cost effectiveness would definitely be a concern.

Technically even pre-LBA28 controllers (silicon deployed prior to 1999) can address 137GB+ drives, it's just that it'll be done using polled IO instead of DMA for anything over the LBA28 limit, so it'll be both slower and more CPU hogging when it does.
 
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