If these are 3.5" drives taken from desktop machines, you will need to use powered USB enclosures, in which case there is no problem hooking four to the Pi. If they are 2.5" notebook drives, use adaptors to place them in powered enclosures for 3.5" drives. People will tell you that the USB controller on the Pi is not well suited for building a 4 drive RAID array. For this reason, it would be very interesting to hear what the actual performance is with such a setup.
The old Corvus 10MB made by IMI was even better, but not as well as the DEC platter drive units.Imperf3kt wrote: ↑Mon Nov 27, 2017 6:46 am80Gb sata is old?
Damn, I don't know what to do with my 426Mb IDE HDD from 1995 now.
http://stason.org/TULARC/pc/hard-drives ... -FAST.html
Be aware that once you open them, you can never put them back together. HDDs are manufactured in a dust free environment, such as a vacuum.Heater wrote: ↑Mon Nov 27, 2017 4:28 pmActually, I think the most fun that can be had with 4 old 80GB drives is to crack them open and take the motors, platters and magnets out. Beautiful engineering to be seen inside. At least for the 3.5 inch jobbies, I have never opened a laptop sized drive.
Just now I have two such sets of platters and motors on my desk. Wondering how I can drive the motors from a Pi. At least they make good fidget spinners.
The head drive magnets stick to the fridge like crazy!
Many moons ago, a work laptop had a hard drive problem. It was a 2.5" IDE drive, can't remember what capacity it was. I do remember it had Windows 2000 on it. We took the drive out to find a small dent in the metal cover. It wasn't working so we thought there was nothing to lose by taking the cover off, pushing the dent out and reassembling it. Inside it was similar to 3.5" drives, just smaller.
Its not just dust though. A lot of HDDs now include some kind of inert gas such as helium. Open it up and bye bye helium.Mortimer wrote: ↑Mon Nov 27, 2017 10:58 pmMany moons ago, a work laptop had a hard drive problem. It was a 2.5" IDE drive, can't remember what capacity it was. I do remember it had Windows 2000 on it. We took the drive out to find a small dent in the metal cover. It wasn't working so we thought there was nothing to lose by taking the cover off, pushing the dent out and reassembling it. Inside it was similar to 3.5" drives, just smaller.
Well, the operation was conducted on an office desk, the only precaution was to try not breathing on it, and not sneeze.
It went back together, and the laptop booted fine and worked for several years before the machine was retired, at which point the drive was removed, and I think is languishing at the back of my desk drawer.
I might dig it out and see if it is still working.
I remember diagrams like that. They also had things like a human hair and a bit of dust and for some reason a prawn cocktail flavoured crisp.Heater wrote: ↑Mon Nov 27, 2017 11:30 pmI recall that in 1982 I was allowed to use an Intel Development System with a 10MB hard drive. The size of a washing machine. In the manual it showed a diagram of the read/write head hovering over the platter. Along with a particle of smoke that was three or four times bigger than the gap between the head and the platter.
So were we frankly, especially when you consider that the reason the drive wasn't working was because the metal cover was touching the platter and stopping it spinning. We surmised that it must have been touching the platting at the very edge and no where on the writeable surface.
Isn't "fun" reason enough. I experiment with stuff just for fun. It often costs me money to build something I don't have a use for, but if I learn something, or at least have a good time doing it, then is has some value.