I've been using a Matias FK302 since release, roughly ten years now, nearly flawless outside of the occasional bounce.
Naturally as time goes on this got worse to the point i knew a cleaning / replacement was necessary. So I started the process with keycap soup:
Then began opening the switches, they are simplified APLS SKBM clones with Matias tweaks. I've successfully cleaned these switches in the past so I knew what to expect, none the less I "successfully" bent a contact in the first switch opened after a quick clean, I was in a hurry, didn't bother to lube the slider even.
The mount is metal, and is a bit rusty after ~ten years use and abuse, this along with the bent contact, are terms for a complete disassemble, new key switches soldered and paint. So I shelved the keyboard until after the holiday shipping tripe is completed, where I can be assured the switches will arrive un bastardised. < is that a word?
So I went with a Lenovo 54Y9400 I had sitting around. A good membrane (rubber dome) keyboard widely used in data entry.
First few days no issues. Now the real issue is rearing it's ugly head. But what is it?
As I understand, rollover is programmed on board, as in keyboard. Yet when a keyswitch contacts bounce past the point of the programming, you clean / replace the switches. Simple, unless the logic board is borked.
I've been fixing the double characters prior to this sentence, here is an example:
TL;DR example on membrane KB:
1234567890))((.>??MMnNvcxxzASD you get the idea.
This is on the Lenovo 544Y9400 membrane keyboard.
[Searching] links me to mechanical switches why what and how toos, nothing about when a membrane KB does this, I've looking in /dev for ukbd to no avail, done a short bit of searching for the keyboard controller in Ubuntu, google is helping by assuming I'm working with a MIDI device. And eliminating all other interests several pages in.
Thoughts, ideas?/ << nice bounce eh?/
Western Digital on Tuesday introduced its fourth-generation enterprise-class hard drives filled with helium. The HGST Ultrastar He12 HDD can store up to 12 TB of data, whereas its version based on shingled magnetic recording technology has a capacity of 14 TB (note, both are under the He12 brand). It is noteworthy that to increase the capacity of the HDD, Western Digital had to increase both the amount of platters in the new drives as well as their areal density.
The HGST Ultrastar He12 is built upon a completely new platform featuring eight platters, up from seven inside previous-gen drives that use Western Digital’s HelioSeal technology. The manufacturer does not reveal a lot about the new HDDs, but it looks like as the company has learned more about helium-filled drives and managed to squeeze eight platters into a 3.5” HDD to increase capacity. To add the eighth platter, Western Digital had to redesign internals of its HDDs (including arms and heads) significantly. Over the next few months, we will probably learn more about HGST's fourth-generation HelioSeal platform in general and the new HDDs in particular. Moreover, Western Digital recently said that the HelioSeal is here to stay for a long time as demand for high-capacity SSDs is growing. Therefore, helium will be used not only for PMR- and SMR-based hard drives, but for HDDs featuring future magnetic recording technologies as well (i.e., HAMR, BPM, etc.).
The increase of the amount of platters inside the Ultrastar He12 was not the only way to raise its capacity, as Western Digital also had to increase the areal density of each platter. The Ultrastar He12 with a 12 TB capacity featuring perpendicular magnetic recording technology has an areal density of 864 Gbit/inch2, whereas the Ultrastar He12 with 14 TB capacity and SMR technology has an areal density of around 1000 Gbit/inch2.