What is the difference between LiteOn SOHD and SHD

I’m in the process of looking at replacing a faulty DVD-ROM drive. In searching through the Liteon site, I noticed that they have a couple of drives that appear to be identical in specs:

  1. SHD - 16P1S
  2. SOHD-16P9S

What is the difference between the SHD and SOHD designation? Also, my current drive, SOHD-167T, has a 512KB cache whereas the two drives listed above have 256KB cache. Will that make much of a difference in performance? Thanks for the input.

ez

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