HR21-700 Internal Temp Lowered

What drive is that and where would one get it?

Mine went down as well - my status screen says 32F



Honestly, I don't recall looking at it prior to adding the external drive, so it may have been that way before.

So, I guess this means that the internal drive does not even spin up if an external drive is present?

Brad

rickeame said:

What drive is that and where would one get it?

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Model: WD10EACS
WD Caviar Green
WD10000CSRTL (Retail Kit)

I got mine at Frys for $159 + shipping

And you put it internal, or you put it in an external case thus making the unit cooler?

rickeame said:

And you put it internal, or you put it in an external case thus making the unit cooler?

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I installed the drive in an Antec MX-1 External Drive Enclosure and then connected it to the HR21 via ESATA (6.6 ft. SIIG cable) connection. Thus the 42 degree difference. I never expected that significant of a difference in the internal temperature. IMO, this is an important consideration that I had not seen discussed before on the forum.

Strange. I put a usb fan on my HR20 and dropped it 21 degrees. Adding an ext hdd later did NOTHING.

I understood that the only temperature sensor in the HR2x is one inside the hard drive. Not all drives have a temperature sensor. If you replace the drive in the HR2x with one that does not have a temperature sensor, I believe the temperature will always read 77 degrees. Also, if you install an external drive, you are no longer measuring the temperature inside the HR2x and if the drive you are using has no temperature sensor, it will also read 77 degrees.

I dont think this is accurate. My hr20 ran 127 constantly, when I added a usb fan it droped to 104-106 on avg.

Since Ive installed the ext HDD, it still shows 104-106 and changes as the day heats up and cools down.

elwaylite said:

Strange. I put a usb fan on my HR20 and dropped it 21 degrees. Adding an ext hdd later did NOTHING.

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Same here. (on the HR20-700.) FAP 750 on it did not change the temp, and the fan lowered the temp from 129 to 104 or 102, depending on ambient temp.)

avonabudget said:

I just successfully installed the WD 1TB Green/Antec MX-1 ESATA combo and my HR21-700 internal temperature has gone from 119 degrees Fahrenheit down to 77 degrees Fahrenheit.

In addition to the obvious benefit of additional recording capacity, the lower internal temp has got to be good for the overall long term health/performance of the unit.

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I think a 77 temp reading may mean the temp sensor has failed or not working. I have read the HR's take their temp reading from the drives S.M.A.R.T firmware.

schneid said:

I think a 77 temp reading may mean the temp sensor has failed or not working. I have read the HR's take their temp reading from the drives S.M.A.R.T firmware.

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Well if that's true, then so much for the 77 degrees. A better design would be such that an internal temp reading is independent from the internal drive's operational status.

I have 2 HR21-700s. Both would run between 109 degrees and 114 degrees. When I added an external drive to the first HR21, I checked the temperature and it was at 113 degrees. I plugged in the external drive, powered it up and hit the red reset button. When the system came back up (about 4 or 5 minutes) I again checked the temperature and it was 77 degrees and has not varied since.
Adding an external drive to my second HR21 had the exact same result.

I doubt any dvr would operate at 77 degrees even if you powered down the internal drive or your room temperature is way cool with a lot of forced air!

Monoprice has a 9.99 laptop cooler that plugs into the USB and lays on top of my HR20s. Temp went down from 127 or so to 115-118.

schneid said:

I think a 77 temp reading may mean the temp sensor has failed or not working. I have read the HR's take their temp reading from the drives S.M.A.R.T firmware.

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You are correct. I've had three 21-700s, returned one that read 77 degrees and got another one that read 77 degrees. "Housekamp" the Puddy Tat has stated on other threads that this reading indicates a failed or non-functioning temp sensor. Him I believe. I still have one 21 that reads 77 degrees and I keep placing my palm on the case and it is relatively cool to the touch. And it works perfectly.

Rich

Based on the posts I have seen here, when eSATA is used the internal disk on HR21 (at least the HR21-700 model) is put on standby/sleep. But that's not the case for HR20.

Cyrus said:

Based on the posts I have seen here, when eSATA is used the internal disk on HR21 (at least the HR21-700 model) is put on standby/sleep. But that's not the case for HR20.

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That may be the case. At least, the temperature sensor in the internal disk no longer reports the temperature. My two HR21-700s both have an external drive and both report temperature of 77 degrees. If I put a thermometer next to the air vent on the case it reads 106 degrees, so I know the 77 degrees is wrong.

HR21-200 always shows 32 degrees when external HDD is hooked up. It seems that when ext. hdd is plugged in, it disables temperature sensor.

Cyrus said:

Based on the posts I have seen here, when eSATA is used the internal disk on HR21 (at least the HR21-700 model) is put on standby/sleep. But that's not the case for HR20.

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Not correct. I have one 21-700 that has an eSATA hooked up and reads temp properly. I was beginning to think that the 21s did that too, until I got my third one and it read the temp properly. Ya gotta admit these things, as wacky as they are, are interesting. I can't help but wonder what people who don't hop on this forum do. How could you possibly run a multiple 20/21 without using all the knowledge so freely given on this forum?

Rich

CKNAV said:

HR21-200 always shows 32 degrees when external HDD is hooked up. It seems that when ext. hdd is plugged in, it disables temperature sensor.

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Wrong. Just a bad or disabled temp sensor.

Rich