Forums › Life › Computers, Gadgets & Technology › UK : East : E-bike+SSD portable disk vs UK rural broadband, data transfer rate test..
One of our rural sites uses a patients database which is about 17 GB in total. The broadband at this site (a combination of two ropey British Telecom ADSL circuits + a satellite link) is way too slow and unreliable to transmit amount of data (the satellite is on a data quota as well during daytime, and in the night everywhere from Wales to Istanbul is trying to access the satlink).
So I have to manually collect the weekly backups from this site (14km from where I live) one I have triggered them remotely rather than upload them to secure cloud storage.
I had to ride there anyway to deal with a misbehaving computer in the basement nurses office (which hadn’t got its remote access activated) as well as a server update, so also created two more datasets of backups stored on a USB SSD.
So there was 50 GB in total on the disk when I rode back home. I use a cheap Windows phone as a GPS unit with ride tracking software -this shows it took me 35 minutes 33 seconds to travel the 14km on my e-bike (I rode slightly slower due to the weather)
50 GB is 51 200 Megabytes.
8 bits in a byte, so this is 409 600 Megabits (to simplify things I’ve left out any padding bits used on a serial data circuit and/or network overhead from packet headers etc; but this does also mean I am only counting the actual useful data in the backup).
35 min 33 seconds is 2100+33 = 2133 seconds.
So the data transfer rate is 409 600 / 2133 = 192,03 MB/s 😎 (even with VDSL the upstream on most circuits is only 10MB/s)
LMAO, I like it lmao. Funny fucker lol.
Also, a kilobyte being 1024 bytes is supposedly actually known as a kibibyte and a kilobyte is still 1,000 bytes. I know no-one would really agree with that but according to QI and their source being some internet engineering place, I’d guess it’s correct but useless as not much software would ever use that definition.
The definition got changed in the late 1990s (to bring it in line with all other metric units) – before that kilobyte was used for 1024 bytes.
Windows still calculates a kilobyte as 1024 bytes, it varies with other operating systems. To confuse things further, modern hard drive capacity is usually stated in the “new/metric” units, which is why Windows seemingly underreports drive sizes.
Compared with 30 years ago for day to day use other than kernel level coding all these the rounding errors do not cause too much hassle – back then 24 bytes mattered a lot more due to the lack of RAM compared with today – if coding a database you might even use a byte to store 8 flags of data (true/false) whereas today many apps would use a whole int for that (4/8 bytes), which is why today I end up carting around 50 GB from place to place :laugh_at:
Yeah HDDs are a pain in the arse. You get the capacity from the manufacturer which is always a nice round number (SSDs differ) but when formatted under windows the stated capacity is well below the actual capacity.
@General Lighting 986958 wrote:
The definition got changed in the late 1990s (to bring it in line with all other metric units) – before that kilobyte was used for 1024 bytes.
Windows still calculates a kilobyte as 1024 bytes, it varies with other operating systems. To confuse things further, modern hard drive capacity is usually stated in the “new/metric” units, which is why Windows seemingly underreports drive sizes.
Compared with 30 years ago for day to day use other than kernel level coding all these the rounding errors do not cause too much hassle – back then 24 bytes mattered a lot more due to the lack of RAM compared with today – if coding a database you might even use a byte to store 8 flags of data (true/false) whereas today many apps would use a whole int for that (4/8 bytes), which is why today I end up carting around 50 GB from place to place :laugh_at:
BBC News – SA pigeon ‘faster than broadband’
You might get replaced by a pigeon GL.
@Digital Buddha 986965 wrote:
BBC News – SA pigeon ‘faster than broadband’
You might get replaced by a pigeon GL.
:lol_big:
I remember reading that a few years ago (its not the only such experiment) although there are more data security issues doing it that way – I’m one of only 3 people with this model of e-bike in the entire county and get my cycling jackets from the other end of England (near where Tryptameanie is), where they are available in a distinctive red colour no one else has. This would make impersonation or misrouting harder, compared to pigeons of which there are literally thousands of round here both in urban and rural areas (East Anglia is a main habitat region for collared doves).
Also I can meow at the cats and they do not bother me – although town cats are lazy, the rural ones (many of which are related to one another) form prides and still tend to hunt any birds in their territories..
Coincidentally I was going to use this picture for a poster at work explaning why we need firewalls and IT security procedures..
Do they have you riding around with an external hard drive?
its the size of a bank card but slightly thicker, as I already use an Ortlieb dual pannier system this hardly takes up any space.
The UK has moved on slightly from the days of these..
[img]http://vitrinemuseum.ewi.tudelft.nl/images/disks/DSC_2390%20(Large).JPG[/img]
which only stored about 20 megabytes!
I read a thread on HDDGuru about a man trying to get info on a particular model of HDD and he mentioned he was an only tech from way back and he’s actually worked on a 3MB HDD back in the day. I also remember seeing a reprinted ad fpr a 30MB HDD at the bargain price of just $3,000…….
My high school had a 10MB hard drive on the BBC Micro Econet (16 workstations + a server) in 1986, this was fast enough and big enough for me to hide a RAT in my personal storage area without being discovered (as even if the teachers went through it they would have only found a stored screen image from a character mapped display in which I’d buried the RAT code and removed the end marker from the BASIC code which triggered part of it so it looked like a binary file. TBH I wouldn’t be surprised if the RAT remained there a couple of years after I left in 1990 (when they eventually replaced these with PC-based workstations).
@General Lighting 986987 wrote:
My high school had a 10MB hard drive on the BBC Micro Econet (16 workstations + a server) in 1986, this was fast enough and big enough for me to hide a RAT in my personal storage area without being discovered (as even if the teachers went through it they would have only found a stored screen image from a character mapped display in which I’d buried the RAT code and removed the end marker from the BASIC code which triggered part of it so it looked like a binary file. TBH I wouldn’t be surprised if the RAT remained there a couple of years after I left in 1990 (when they eventually replaced these with PC-based workstations).
Are you talking about something similar to steganography there?
similar but on a smaller scale. The screen shot was of the front menu for a wordprocessor app we had to use, it was set up so running the control app would just look like the wordprocessor menu. BBC Masters of that era had a * and # on the numeric keypad like telephones, it was set up so double tapping # would go to the real wordprocesor (if teachers were watching) but *(access code)# would open up the RAT control menu, which could do a variety of things such as send text messages to other computers without displaying on the audit log (like passing a note around in class), remote procedure calls and memory inspection of workstations (including the server, which enabled me to get the SYST ID (equivalent of root on Linux) even when the teacher (this very strict battleaxe of a maths teacher) had decided to shut off her console monitor at the mains), or deliver a copy of the RAT to another machine.
TBH I’ve forgotten how to do half of that at low level nowadays and if I do mention it to any younger folk of school age I warn them first as trying any stunt like that in school nowadays gets you arrested and the bobby and NCA end up having a talk to your parents.
I’m impressed you were able to achieve that at the age you were.
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Forums › Life › Computers, Gadgets & Technology › UK : East : E-bike+SSD portable disk vs UK rural broadband, data transfer rate test..