71–80 of 86 posts
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Isn't it inverse square?
No. Magnetic fields fall off as 1/d when d is small compared to the size of the magnet, progressing to 1/d^3 when d is large compared to the magnet. (E.g. weird edge case-- it's inversely proportional to distance from an infinitely long wire). Electromagnetic radiation from point sources falls off as 1/d^2.
My story: In 1996 or 97, a friend brought me his Compaq Deskpro, the SCSI HDD had stopped working. No sound at all, dead. Tried everything, checked voltages, reconnected cables trying to clear any oxidation. Wouldn't spin at all. Well, called it a night. Next day, decided to take it out of the chassis for a last test, connected outside. Not only it spun, it worked fine!!! WTH???? Well, into the chassis it went. Nothi…
Perhaps a defect in a cable or connector such as a broken wire or a dry solder joint? These often cause problems that mysteriously appear or disappear as the cable is moved and the changing forces on the defect make and break the connection.
My anecdote: Around 1993 I had a Commodore Amiga with an A590 external hard drive. A big enclosure that could be connected to the expansion port on the left of an Amiga 500, containing a very precious 20MB hard disk. One day, it stopped working. I tried everything but I couldn’t get it to work. A friend offered to take a look at it so I put it in my backpack and took the train to my friend. When connected to his A500…
Fun fact: that amstard pc had a pair of AA batteries to keep the cmos powered up and they fit right on top of the box, right where the monitor fit snugly.
This a fantastic webpage.
Simple and straight to the point ... although some navigation would be helpful to see, you know, the rest of the website.
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Really? He doesn't close the tags.
That's only a problem for XHTML. HTML5 implicitly closes the previous tag when you open the next one; thus, a inside a is an implicit , if you will.
tag when you open them then? It doesn’t do it for, say, . Bug?
I have fixed a ton of drives, in general. Board replacements, swapping platters, head swaps, etc. Some takeaways: I started doing this under tupperware, and that worked. I built a "cleanroom" out of a new sandblasting cabinet, and that worked better. Later i built a laminar flow bench out of a cheap kobalt tool-box and some plexiglass, and that was better still. Swapping the control boards works on some makes (wd), m…
Do you (or anyone else) have ideas for what to do with - a MyBook that isn't recognized anymore? I've figured out there's probably some encryption in the casing because when I disassemble it and connect it directly it shows up as unformatted or something. - an ssd which seems even more dead. Personally I've gotten back erased data (photorec) and data from at least 2 other disks (tilting the disk or freezing the disk)…
My anecdote: Around 1993 I had a Commodore Amiga with an A590 external hard drive. A big enclosure that could be connected to the expansion port on the left of an Amiga 500, containing a very precious 20MB hard disk. One day, it stopped working. I tried everything but I couldn’t get it to work. A friend offered to take a look at it so I put it in my backpack and took the train to my friend. When connected to his A500…
FWIW the failure mode (which was also common in drives for the SPARCStation at the time) was called "stiction." That occurred when the drive parked the heads, after power down, into the landing zone on the platter. At Sun we took apart a number of failed drives (which could also be recovered sometimes by giving them a sharp twist) and hunted for the root cause. The answer was that over some time the drive heads becam…
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You know what is sad about a small business (kjmagnetics.com) that you linked to? They are exactly what will be killed off by Amazon. The small and knowledgeable specialty store very similar as I am sure many of us remembered happened to 'Stereo Stores' once the big boxes stores came along (or hardware stores). Nothing new about this of course just that with Amazon it's greatly accelerated.
Amazon is 8 years older than K&J Magnetics...but sure