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Recent content by JoeComp

  1. J

    Buying hardware on ebay from china.

    The first one, friendshops852, does the shipping scam that I described previously (as does the last, 4seasonstores). The middle one, ouyou2010, is actually in Hong Kong, not mainland China, and they do not scam, as far as I know. For some reason the unscrupulous sellers seem much more prevalent...
  2. J

    Buying hardware on ebay from china.

    If you read what I wrote, you would see that I was talking specifically about unscrupulous China sellers. I asked how many of your "hundreds" of transactions were from China in the past few years. You have only listed 6. Here are three China sellers who meet your 98% threshold. Which do you...
  3. J

    Buying hardware on ebay from china.

    Only 6 of those are from China.
  4. J

    Buying hardware on ebay from china.

    How many transactions from Chinese sellers in the past few years, and what were their positive feedback percentages?
  5. J

    Buying hardware on ebay from china.

    No, you are falling into the same trap that many naive ebay buyers do, and it is exactly what these unscrupulous sellers are counting on to take advantage of. As I suggested, if you see a China seller wtih 99% positive feedback, it is NOT true that you have a 99% chance of having a positive...
  6. J

    Buying hardware on ebay from china.

    Unfortunately, that is not true. 99.0% is not nearly good enough. I have seen and heard about quite a few sellers in China with 99.0 or 99.5% positive that are not trustworthy. They seem to be very good at gaming the system. Obviously, if it were really true that 99% of the customers had a...
  7. J

    Buying hardware on ebay from china.

    One thing that I found with some of the ebay sellers in China is that they will specify the ePacket delivery, which has tracking available with the US postal service. However, the fraudulent sellers (which seems to be a lot of the ones in China) will ship you a "free gift" by ePacket and they...
  8. J

    Hardest component to pick in a massive Home Storage Solution

    No, I am not wrong. This is basic electronics. For a component to be able to change the current without changing the voltage, it would need to have an I-V curve with a completely vertical line. The only common passive components that approximate this are diodes (rectifiers), but fans (electric...
  9. J

    Hardest component to pick in a massive Home Storage Solution

    Again, this is nonsense. If you change the current sourced through a fan, the voltage across the fan also changes. As for motor efficiency, that is a red herring. As I already explained, the key point is that the fan wall needs some minimum air flow to keep the HDDs cool, and given that...
  10. J

    Hardest component to pick in a massive Home Storage Solution

    Hilarious! It is good that you admit that you do not understand basic electronics and will not waste your time posting more nonsense.
  11. J

    Hardest component to pick in a massive Home Storage Solution

    Nonsense. There is no such thing as "static pressure fans". Some fans are better at moving air when there is a pressure differential across the fan, but it is not a black/white distinction. For a given air-restriction, different fans will have different air throughputs. The actual graphs of...
  12. J

    Hardest component to pick in a massive Home Storage Solution

    Why not get a fan controller? Then you can adjust the voltage to multiple fans easily. And it should specify the currents that it can handle. Although I am not sure whether that will decrease the power consumption a lot, since there will be some current going through a resistor (it will reduce...
  13. J

    Hardest component to pick in a massive Home Storage Solution

    Actually, fans capable of high static pressure are an excellent choice for the fan wall of the Norco 4224, since the airflow through the HDDs sleds is restricted. In order to get significant airflow through the restricted space, it is necessary to create a low-pressure region between the fanwall...
  14. J

    Hardest component to pick in a massive Home Storage Solution

    That is nonsense. Static pressure refers to the pressure difference "across" a fan when there is no net air flow through the fan. For example, if you seal a fan to an opening in an otherwise airtight box, then run the fan at full voltage. The pressure difference between inside the box and...
  15. J

    Hardest component to pick in a massive Home Storage Solution

    I just thought 7W sounds like it is at the high end, like you say with high static pressure, and also full speed. I wonder if the power usage is 7W in your actual server. Also, I don't know if you have a supermicro motherboard, or some other motherboard that allows you to adjust the fan speed --...
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