Category Archives: Uncategorized

Recovering an Unreadable SD FAT32 SD Card (Or possibly USB Thumb Drive)

I recently had a Micro SD card that stopped being able to be read after applying a ‘kitkat’ patch to allow my rooted phone to use the card from other applications.  It was more likely the patch itself didn’t cause the problem, but a large file I was moving corrupted the file system.

After rebooting my phone I got the dreaded SD Card with Exclamation point ‘Unreadable Card’ Instead of formatting it I decided to attempt to recover it.

It was unreadable from either Ubuntu nor Windows,

In windows it didn’t provide very useful information, but in attempting to mount it in Ubuntu I at least got a real error ‘Mount Failure, Could not read Superblock’ which gave me a hint on what was needed to fix it.

I could have tried to repair it with GPARTED in Ubuntu but I didn’t have it installed at the moment so instead I booted my laptop into Windows 8.1 and from an Administrative Command Prompt (Launch CMD as administrator)

Fortunately, the SD card partition is FAT32 so I attempted to fix it:

CHKDSK D: /F /V /R /X

D: was the SD card with the problem.

This might also work with other removable drive types like USB Thumb drives.

SUCCESS!

2015-01-23 11_53_19-Clipboard

A word of warning,  Copy all of the files off of the card before using it again to avoid losing anything you might want off the card.

Ultimately it would be a good idea to copy all the data off, reformat the card, and copy it back.

Source: http://technet.microsoft.com/enus/magazine/ee872425.aspx

This may not look like much, but this is the makings of 64kb external SRAM, 6502 emulator. Now I understand…

This may not look like much, but this is the makings of 64kb external SRAM, 6502 emulator. Now I understand why early computers had indicators for the address and data bus. My goal is to emulate an apple II slots and all. The CPU should be cycle correct, though runs at about 4mhz. I didn't write the 6502 cpu emulation, I just modified it to work with external memory. Eventually I would like to stick this into a vintage case with a disk drive, video, keyboard and see if anyone can tell.

11/7/13 - 1

Circuit Patterns Trading Cards from Arachnid Labs ID: 1474 – $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits

Adafruit Industries, Unique & fun DIY electronics and kits Circuit Patterns Trading Cards from Arachnid Labs ID: 1474 – If you’re an industrial designer, chances are you’ve got a set of IDEO method cards. If you’re an artist or musician, maybe you like to flip through a set of Brian Eno’s Oblique Strategies. And if you’re an engineer, now you can brush up on techniques and discover time-tested patterns