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by speculatrix2
Thu Jul 02, 2020 10:18 pm
Forum: User groups and events
Topic: Coding club, West of Cambridge, CB23, England, needs helpers and equipment
Replies: 2
Views: 2353

Re: Coding club, West of Cambridge, CB23, England, needs helpers and equipment

we did get started, and had a half dozen "workstations" set up with mainly Pi 3s and the odd Pi4, as well as a laptop running raspian-x86

sadly we had to to put it on hold due to the C thing.

hopefully we will be able to begin by the Autumn term
by speculatrix2
Fri Jan 31, 2020 8:01 pm
Forum: User groups and events
Topic: Coding club, West of Cambridge, CB23, England, needs helpers and equipment
Replies: 2
Views: 2353

Coding club, West of Cambridge, CB23, England, needs helpers and equipment

We're going to start a coding club in Caldecote, CB23 in March, and we're looking for a few motivated responsible people to help supervise. You don't need to be a massive expert to help. We're hoping to have 7 or 8 Pis set up for children to work in pairs. The existing volunteers have a few Pis alre...
by speculatrix2
Fri Jan 31, 2020 7:57 pm
Forum: General discussion
Topic: Multi-Seat use of RPi 4
Replies: 48
Views: 8131

Re: Multi-Seat use of RPi 4

I'm very interested in people's experience in using a Pi4 in multi-seat configuration. It's not that Pi's are particularly expensive but we're starting a coding club (in a village west of Cambridge) and want seven Pis set up with kids working in pairs. We can get hold of free monitors, keyboards and...
by speculatrix2
Mon May 20, 2013 9:31 pm
Forum: General discussion
Topic: ext3/4 and SD-card wear leveling
Replies: 134
Views: 65309

Re: ext3/4 and SD-card wear leveling

I'll have to check with the SD spec but i'm pretty sure it states that reading an erased block returns zeros. It doesn't matter what is actually written in the physical memory, but if reading an erased block returns zeros, then writing ones will most likely not deallocate the block, because it does...
by speculatrix2
Mon May 20, 2013 8:38 pm
Forum: General discussion
Topic: ext3/4 and SD-card wear leveling
Replies: 134
Views: 65309

Re: ext3/4 and SD-card wear leveling

an important point to note is that erasing flash memory writes ONES not ZEROES to it.

if you can't trim a flash drive, writing ones to it like this will allow most flash controllers to mark blocks as unused:

tr '\000' '\377' < /dev/zero | dd bs=1024 count=$BLOCKS

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