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Feb
1
comment How does a laptop detect an HDMI cable is connected?
hdmi.org/installers/insidehdmicable.aspx suggests 3 possible mechanisms - a dedicated "hot plug" pin, the CEC system (although I think that's in the other direction), and DDC for monitor identification (size etc).
Jan
28
comment Multiple SSH connections to the same system - is it possible?
Not only this, but you can have multiple links between the same pair of systems. You may also find screen or mosh useful if you want the "Windows remote desktop" behaviour for the command line: a single interface which is passed around multiple links.
Jan
6
comment Firefox 43 puts black spots on display
While this is characteristic of failing hardware, it can also just be a video driver error: transferring to or from the wrong region of memory.
Dec
30
answered bash scripting: too many arguments in if
Dec
21
comment Why doesn't mobile broadband have interference problems?
@Hooli there are various alternative technologies that can be deployed, e.g. weightless.org using the old analogue TV bands.
Dec
21
answered Why doesn't mobile broadband have interference problems?
Dec
12
answered When I plug an Ethernet cable into my computer, is my computer directly connected to every server on the Internet?
Dec
2
comment Power monitor from USB
USB2 is normally 2.5W. USB3 "power delivery" can manage 20V 5A = 100W, so that should work. Most of the power is for the backlight.
Nov
24
comment Hard drive clicking for 16 times during startup
The most likely cause is the bearing has partly seized and the drive motor is unable to overcome the torque required to get the drive moving. Sometimes you get lucky and it manages to start. There's no way to fix this without opening the drive, which will destroy it unless you're in a professional cleanroom. It will gradually deteriorate until it's unable to ever start.
Oct
29
comment Do desktop computer motherboards have GPIO? If they do, how to read from or write to them
The linux package "lm-sensors" lets you read the devices on the I2C bus; this will usually be a set of temperature sensors, fan controllers, and identification EPROMS on you DRAM.
Oct
20
comment How is the burned BIOS/firmware code executed from the CPU?
See superuser.com/questions/988473/…
Oct
20
comment How does a BIOS determine the amount of available RAM?
On detecting memory: the DIMMS have a small EPROM that says what they are and what timings should be used. en.wikipedia.org/wiki/Serial_presence_detect
Oct
19
comment Why is the first BIOS instruction located at 0xFFFFFFF0 (“top” of RAM)?
@FernandoPaladini for a "complete" reading try drdobbs.com/parallel/booting-an-intel-architecture-system-par/… , which has the little detail that at boot the CPU drives the top 12 address bits high (expanding the 20-bit real mode addresses into 32-bit hardware addresses).
Oct
14
comment Why does my SSD internally encrypt data, even without a password set?
It's not true anyway: Flash is not symmetrical. Block erase usually sets all bits to 1 and they are programmed to 0 by charge injection through the dielectric. It's that which causes the wear.
Oct
13
awarded  Revival
Oct
6
comment What's the point of hard drives reporting their physical sector size?
It does seem to be about non-windows ("esoteric") OS and RAID controllers.
Oct
6
comment What's the point of hard drives reporting their physical sector size?
An article about raid controllers not supporting 4K: serverfault.com/questions/593742/…
Oct
6
comment What's the point of hard drives reporting their physical sector size?
@qasdfdsaq write size is not necessarily the same as erase size. 4K will be the granularity of the block "in use" tracking. Meanwhile I'm now convinced that the last part of this answer about ZFS is the correct one: utcc.utoronto.ca/~cks/space/blog/tech/…
Oct
6
comment What's the point of hard drives reporting their physical sector size?
Windows aligns new partitions, but upgrading from XP to 7 does not retroactively fix the partitions. And XP isn't dead yet. I have a point-of-sale system here running embedded XP off an SSD. I suspect Intel had some customer who needed a million SSDs that supported XP.
Oct
6
revised What's the point of hard drives reporting their physical sector size?
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