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by peterlite
Fri Jul 21, 2017 1:55 am
Forum: Advanced users
Topic: Create OS image NOT clone of SD
Replies: 5
Views: 605

Re: Create OS image NOT clone of SD

You can also truncate the unused portion of a disk image. You use gparted to shrink the last partition, which leaves part of the card unused. you can then chop off the unused part of the image. I used it to move 5 GB from a 16 GB card to an 8 GB card. It is messy. I am adding it to complete the list...
by peterlite
Fri Jul 21, 2017 1:40 am
Forum: General discussion
Topic: Pi3 Running an external USB3 Hard Drive
Replies: 9
Views: 1004

Re: Pi3 Running an external USB3 Hard Drive

Heh. Thanks folks. So no, maybe, yes.. lol Its looking on balance that it should be ok pending which drive I use. Peterlite, you mention youve used dozens of drives? Given your warning, which drives work? For USB chip problems, look at posts like the following: https://www.raspberrypi.org/forums/vi...
by peterlite
Thu Jul 06, 2017 11:49 pm
Forum: General discussion
Topic: Pi3 Running an external USB3 Hard Drive
Replies: 9
Views: 1004

Re: Pi3 Running an external USB3 Hard Drive

No problems with dozens of 2.5" disks. They are usually 5900 RPM, not 7200 RPM. 0.8 amps is a common peak startup. You can run one but not two. Plenty of power left for keyboard, mouse, extra Wifi adapter. There are lots of pasts on the same topic under NAS. Note that some USB3-SATA chips are really...
by peterlite
Thu Jul 06, 2017 11:35 pm
Forum: Advanced users
Topic: How to identify what's making one RPI3 faster?
Replies: 11
Views: 795

Re: How to identify what's making one RPI3 faster?

http://www.raspberrypi-spy.co.uk/2015/11/raspberry-pi-microsd-card-shoot-out/ oem:0x5344 and the other id listed near the bottom of the article. Note that the benchmark measures only a small amount of data. Many cards are fast for small amounts then slow down for larger amounts because their erase c...
by peterlite
Wed Jul 05, 2017 12:17 am
Forum: Beginners
Topic: Using the pi 3 as NAS
Replies: 4
Views: 565

Re: Using the pi 3 as NAS

2.5" disks need about 0.8 amp. The Pi 3 USB ports supply 1 amp. Your first disk will work then you need an external powered USB hub. There are several posts on this topic. Magnetic disks often require a large startup power that may not be mentioned in the specs. Look for external power with a good m...
by peterlite
Tue Jun 06, 2017 6:53 am
Forum: Off topic discussion
Topic: What happened to British Airways computers?
Replies: 44
Views: 3140

Re: What happened to British Airways computers?

Maybe they used PoHTTP to power their network. Someone unplugged the TP-Link router in head office. They no longer had packets of power going out to other devices. System down...

Someone should have told them about the Pi Zero and how Zero stands for Zero electricity use. :ugeek:
by peterlite
Mon Jun 05, 2017 12:56 am
Forum: Advanced users
Topic: Raspberry Pi smart Home
Replies: 13
Views: 1053

Re: Raspberry Pi smart Home

For toasters and remotes, you might have to break open the device to find out what chips are used inside. From there, you might have a way in. For the toaster example, the toaster might have an electronic heat sensor with a connection you can replicate to the Pi for monitoring the temperature of the...
by peterlite
Mon Jun 05, 2017 12:45 am
Forum: Beginners
Topic: Noobie dad Question
Replies: 9
Views: 547

Re: Noobie dad Question

Which kit? What is in it? It sounds unusual to drop out of Raspbian so fast. You might want to read some of the posts about shutting down the Pi to avoid similar strange errors in the future. Use the Raspbian shutdown to make the OS write all the current data out to disk then give the disk a couple ...
by peterlite
Mon Jun 05, 2017 12:40 am
Forum: Beginners
Topic: Possible Projects
Replies: 3
Views: 305

Re: Possible Projects

Pi 3B has the most flexibility. Pi Zero and Zero W can be easily connected to another computer as a USB dongle. They both have the memory to run most software. If you have spare computer bits, you can connect up old disks to build a NAS. Learn RAID and all that stuff. You could look for software des...
by peterlite
Tue May 30, 2017 11:05 pm
Forum: General discussion
Topic: Is a 2nd Pi (for speed) just a waste on my robot?
Replies: 14
Views: 1066

Re: Is a 2nd Pi (for speed) just a waste on my robot?

There are commands for displaying usage by core. You can check what happens with two programs. You could split your code in four to use four cores. Communication between multiple programs in one Pi will be faster than between two in separate computers.
by peterlite
Tue May 30, 2017 3:34 am
Forum: Off topic discussion
Topic: What happened to British Airways computers?
Replies: 44
Views: 3140

Re: What happened to British Airways computers?

If it is a centralised system and breaks, recovery is not automatic and requires the recovery of everything. If their system ran on 500,000 Pi 3Bs, they would be recovering only one and all the other transactions/flights would be unaffected. Recovery is a b*tch. This is where you find out all the ch...
by peterlite
Tue May 30, 2017 3:08 am
Forum: General discussion
Topic: Setting up a Pi 3 for the long haul?
Replies: 44
Views: 3171

Re: Setting up a Pi 3 for the long haul?

There are a few posts on flash memory life. An expensive controller/memory might erase and write 8K blocks while a cheap device erases and writes 64K blocks. It does not make a bit of difference writing photographs. It makes a big difference when updating a database or a tiny file. Plus your super r...
by peterlite
Tue May 30, 2017 2:52 am
Forum: General discussion
Topic: USB drive disconnects and reconnects
Replies: 2
Views: 512

Re: USB drive disconnects and reconnects

Some USB-SATA bridge chips are good and some bad. Run lsusb to get the USB chip id. Google linux and the chip id. You might find it is one of the chips known to have incomplete USB, chips that require special drivers. I moved a couple of disks to new enclosures to make the drives work.
by peterlite
Mon May 22, 2017 9:02 am
Forum: Recommended peripherals
Topic: AVerMedia AverTV Volar Green HD TV tuner USB id 07ca:3835
Replies: 1
Views: 578

Re: AVerMedia AverTV Volar Green HD TV tuner USB id 07ca:383

I went back to testing the device on Linux Mint. MeTV is a dead project that works once started. MeTV finds only a few of the local channels. The sound and video works on those channels. When I scan several times, it locks up randomly and selects a different group of channels each time. VDR runs thr...
by peterlite
Mon May 22, 2017 6:38 am
Forum: Recommended peripherals
Topic: AVerMedia AverTV Volar Green HD TV tuner USB id 07ca:3835
Replies: 1
Views: 578

AVerMedia AverTV Volar Green HD TV tuner USB id 07ca:3835

The AVerMedia AverTV Volar Green HD TV tuner, USB id 07ca:3835, is mentioned in https://www.raspberrypi.org/forums/viewtopic.php?f=35&t=84727 The tuner works in Linux Mint so should work in the latest Raspbian. Is anyone using it, or similar, in Raspbian instead of a media player distribution? What ...
by peterlite
Mon May 22, 2017 6:03 am
Forum: General discussion
Topic: Fit a computer to a mobility scooter?
Replies: 4
Views: 389

Re: Fit a computer to a mobility scooter?

Where would your pimping go next? Your one step forward could be performed on the Pi but what would you want next and the step after that? A Pi with a battery backup, a GPS card, and a 4G dongle could guide the driver and track your exercise for the day. A Pi gives you real flexibility for the futur...
by peterlite
Sun May 21, 2017 7:12 am
Forum: Networking and servers
Topic: RaspberryPi mobile internet router
Replies: 3
Views: 566

Re: RaspberryPi mobile internet router

https://wiki.openwrt.org/toh/nexx/wt3020 There are several really cheap routers that cost about the same or less than a Pi plus power plus card. OpenWRT is preconfigured open source router software for your router or Pi or several other small computers. You can have your cheap router and, if you do...
by peterlite
Sun May 21, 2017 7:05 am
Forum: Cases
Topic: Waterproof case for Pi Zero?
Replies: 7
Views: 5303

Re: Waterproof case for Pi Zero?

Our local shops have food containers that are waterproof, complete with rubber o ring, and in many sizes. They are cheap and often on sale at half price. One is perfect for a zero with a battery and one layer of add-on wiring. I find these cases the best prototyping cases for things not in direct su...
by peterlite
Fri May 19, 2017 1:04 am
Forum: Troubleshooting
Topic: Files gone from an external HDD
Replies: 7
Views: 497

Re: Files gone from an external HDD

A disappeared directory suggests the file system was updating the directory list when the error occurred. ExFAT is a light weight file system with no protection against that type of error. Ext4 and NTFS use journaling as a protection against that type of error. Major changes are recorded in a journa...
by peterlite
Thu May 18, 2017 6:29 am
Forum: Off topic discussion
Topic: NHS attack on WinXP; would an RP be safer?
Replies: 43
Views: 2678

Re: NHS attack on WinXP; would an RP be safer?

Windows, OSX, Android, Chrome, all have proprietary code with no independent code checks. Somebody mentioned NT. NT was supplied with an optional IE that nobody installed and NT ran forever without problems. Then Microsoft made IE compulsory by locking IE code into the NT core. NT with IE crashed ev...
by peterlite
Thu May 18, 2017 1:42 am
Forum: General discussion
Topic: Advise for this beginner
Replies: 3
Views: 417

Re: Advise for this beginner

There is a Raspbian 64 bit version in development for you other PC. I do not think it is ready for a beginner. Linux Mint, Ubuntu, and Debian all share the same packages from Debian. You can install one of them now and Raspbian Pixel 64 later when that distribution is stable.
by peterlite
Thu May 18, 2017 1:38 am
Forum: General discussion
Topic: XFCE on the Pi - Making your Pi GUI run faster!
Replies: 40
Views: 61325

Re: XFCE on the Pi - Making your Pi GUI run faster!

XFCE and LXDE jump all over the place from release to release. I compared them several times on other machines. XFCE would win one year and LXDE the next year. I find the distribution support for the GUI far more important than minor performance differences that change with each version. For those i...
by peterlite
Thu May 18, 2017 1:23 am
Forum: Off topic discussion
Topic: WannaCrypt Microsoft updates for older Windows systems
Replies: 10
Views: 955

Re: WannaCrypt Microsoft updates for older Windows systems

OK, I agree with your maths. In the projects I worked on from day one, we purchased machines 200 or 1000 at a time and demanded identical machines down to the bios level. We could then ugradep 200 or 1000 machines after testing just one from that batch. The updates were often done a whole floor, say...
by peterlite
Thu May 18, 2017 1:09 am
Forum: General discussion
Topic: SD Cards Images for Pi 3 and Pi Zero
Replies: 5
Views: 636

Re: SD Cards Images for Pi 3 and Pi Zero

The Zero is an ARMv6 32 bit processor. The 3B is an ARMv8 with extra instructions and 32/64 bit compatibility. Anything compiled for the Zero will work in the 3B but stuff compiled on the 3B has to have the right compiler settings to work on the Zero. The Zero requires the latest Raspbian version to...
by peterlite
Thu May 18, 2017 12:46 am
Forum: Beginners
Topic: Raspberry Pi 0 without internet Tenda Dongle
Replies: 26
Views: 1233

Re: Raspberry Pi 0 without internet Tenda Dongle

Run lsusb and look for the ID of the dongle. Some USB device manufacturers change the chip every batch. A driver works with one chip but not the next. Google linux + chip id. What is the chip id? The next problem can be power. Some USB devices chew up power when starting. Some wireless devices need ...

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