I am not sure that overclocking is relevant to NAND flash. The issue is quality control for the device. NAND cells are simple and the process drives reliability significantly. Vendors pay per quality, which translates to a number of cycles the device will endure. Well known brands demand and get better dies. Overclocking NAND will result in timing violations that will lead to failed commands - but it will not damage the die. This is different from the traditional overclocking to death of CPUs. The order of magnitude of power makes a significant difference. Assi
-----Original Message----- From: 44net-bounces+assi=kiloxray.com@hamradio.ucsd.edu [mailto:44net-bounces+assi=kiloxray.com@hamradio.ucsd.edu] On Behalf Of Jerry Sent: Tuesday, October 22, 2013 4:11 PM To: 'AMPRNet working group' Subject: Re: [44net] Raspberry Pi
(Please trim inclusions from previous messages) _______________________________________________ Hi Demetre.
Have you studied the Compatibility list... Some are shown to be a bad choice.. Some Kingston are listed as such.
My first two SD cards I got from Fry's Electronics and they were I think, PNY brands. PNY I have found even their USB Sticks are junk.. But the two I got were only $4 ea.. Bad choice for the Pi. One lasted a few weeks the other until I had a sudden power outage about 6 weeks into it.
I now have 2 Kingston SDXC Card 128GB Class 10 SDX10V/128GB Running on TWO pi.. Or Pi Squared.. lol
One is under heavy abuse.. I have tried experimenting with sudden power outages, and constant read writes on one unit... And it has not suffered any issues.. In Fact I even tried it from -20F to +140F for S&G's They are NOT OVERCLOCKED.
The other runs w9hu BBS Linbpq..
What do you use to image the SD card I used to use Windows program WinDisk32 .. I think this is the biggest issue with the Pi SD Cards..
At least I have had no issues with mine since I stopped that practice.
Also what are you using that requires an external HUB.. You can also connect a TNC (other serial devices) to the GPiO port instead of the USB. Have you tried a PiTNC yet? Makes good topping.. :) it is the same size and sits atop the Pi. Like Icing!!
73 Jerry N9LYA
PS I ll try to get back one the conv server as time permits..
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It is not about overclocking in an Flash device. It is about heat generation during erase. Each erase of a flash block generates heat and causes aluminum atoms to migrate from the upper mask layers through the SiO2 toward the isolated gates that store the information. At some point the gate conductivity rises wich leads to the inability of those gates to hold electrical charges for longer times leading to bit flips from 1 to 0...
Never said it was.. Just said my tests did not include overclocking.
-----Original Message----- From: 44net-bounces+n9lya=blueriver.net@hamradio.ucsd.edu [mailto:44net-bounces+n9lya=blueriver.net@hamradio.ucsd.edu] On Behalf Of Assi Friedman Sent: Tuesday, October 22, 2013 7:57 PM To: 'AMPRNet working group' Subject: Re: [44net] Raspberry Pi
(Please trim inclusions from previous messages) _______________________________________________ I am not sure that overclocking is relevant to NAND flash. The issue is quality control for the device. NAND cells are simple and the process drives reliability significantly. Vendors pay per quality, which translates to a number of cycles the device will endure. Well known brands demand and get better dies. Overclocking NAND will result in timing violations that will lead to failed commands - but it will not damage the die. This is different from the traditional overclocking to death of CPUs. The order of magnitude of power makes a significant difference. Assi
-----Original Message----- From: 44net-bounces+assi=kiloxray.com@hamradio.ucsd.edu [mailto:44net-bounces+assi=kiloxray.com@hamradio.ucsd.edu] On Behalf Of Jerry Sent: Tuesday, October 22, 2013 4:11 PM To: 'AMPRNet working group' Subject: Re: [44net] Raspberry Pi
(Please trim inclusions from previous messages) _______________________________________________ Hi Demetre.
Have you studied the Compatibility list... Some are shown to be a bad choice.. Some Kingston are listed as such.
My first two SD cards I got from Fry's Electronics and they were I think, PNY brands. PNY I have found even their USB Sticks are junk.. But the two I got were only $4 ea.. Bad choice for the Pi. One lasted a few weeks the other until I had a sudden power outage about 6 weeks into it.
I now have 2 Kingston SDXC Card 128GB Class 10 SDX10V/128GB Running on TWO pi.. Or Pi Squared.. lol
One is under heavy abuse.. I have tried experimenting with sudden power outages, and constant read writes on one unit... And it has not suffered any issues.. In Fact I even tried it from -20F to +140F for S&G's They are NOT OVERCLOCKED.
The other runs w9hu BBS Linbpq..
What do you use to image the SD card I used to use Windows program WinDisk32 .. I think this is the biggest issue with the Pi SD Cards..
At least I have had no issues with mine since I stopped that practice.
Also what are you using that requires an external HUB.. You can also connect a TNC (other serial devices) to the GPiO port instead of the USB. Have you tried a PiTNC yet? Makes good topping.. :) it is the same size and sits atop the Pi. Like Icing!!
73 Jerry N9LYA
PS I ll try to get back one the conv server as time permits..
_________________________________________ 44Net mailing list 44Net@hamradio.ucsd.edu http://hamradio.ucsd.edu/mailman/listinfo/44net http://www.ampr.org/donate.html
_________________________________________ 44Net mailing list 44Net@hamradio.ucsd.edu http://hamradio.ucsd.edu/mailman/listinfo/44net http://www.ampr.org/donate.html
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Assi Friedman -
Jerry -
Marius Petrescu