Roger: /* Data recovery attempts */

2016-07-29T00:27:48Z

Data recovery attempts

← Older revision		Revision as of 00:27, 29 July 2016
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	repeated many, man times. I'm not sure why it says "Invalid argument!".		repeated many, man times. I'm not sure why it says "Invalid argument!".
	After all these attempts, there was a visible line on the coating of the floppy itself. I'm not sure, but I do not think it was there before I tried data recovery o this floppy. --[[User:Tingo\|Torfinn]] ([[User talk:Tingo\|talk]]) 20:42, 27 July 2016 (UTC)		After all these attempts, there was a visible line on the coating of the floppy itself. I'm not sure, but I do not think it was there before I tried data recovery o this floppy. --[[User:Tingo\|Torfinn]] ([[User talk:Tingo\|talk]]) 20:42, 27 July 2016 (UTC)

			Have you checked on the [http://www.classiccmp.org/dunfield/img/index.htm Disk/Image software archive] at classiccmp? /[[User:Roger\|Roger]] ([[User talk:Roger\|talk]]) 00:27, 29 July 2016 (UTC)

Tingo: /* Data recovery attempts */ new section

2016-07-27T20:42:54Z

Data recovery attempts: new section

New page

== Data recovery attempts ==

I have previously used [http://www.garloff.de/kurt/linux/ddrescue/ dd_rescue] successfully, but only on hard drives. My experience with data recovery from floppies is limited, and I worry about potential wear on the floppies, and on my floppy drive. But I used this floppy as a test, to see if I could recover the data on it. First i tried [https://www.gnu.org/software/ddrescue/ GNU ddrescue], since it is (supposedly) is improved compared to dd_rescue.
tingo@kg-t2$ ddrescue -n /dev/fd1 ./210628F01-XX-01D.image.5 ./210628F01-XX-01D.image.5.log

Press Ctrl-C to interrupt
Initial status (read from logfile)
rescued: 0 B, errsize: 0 B, errors: 0
Current status
rescued: 0 B, errsize: 1261 kB, current rate: 0 B/s
ipos: 65536 B, errors: 1, average rate: 0 B/s
opos: 65536 B, time from last successful read: 0 s
Finished
tingo@kg-t2$ ddrescue -n /dev/fd1 ./210628F01-XX-01D.image.5 ./210628F01-XX-01D.image.5.log

Press Ctrl-C to interrupt
Initial status (read from logfile)
rescued: 0 B, errsize: 1261 kB, errors: 1
Current status
rescued: 0 B, errsize: 1261 kB, current rate: 0 B/s
ipos: 0 B, errors: 1, average rate: 0 B/s
opos: 0 B, time from last successful read: 0 s
Finished
Unfortunately, it looks like GNU ddrescue simply doesn't work on this system at all - it could not read even one record from the floppy.

So I tried [http://www.garloff.de/kurt/linux/ddrescue/ dd_rescue]. It did better - it managed to read data from the floppy, but it read even less than a simple 'dd' did. And it gave these errors:
dd_rescue: (info): ipos: 31290.5k, opos: 31290.5k, xferd: 31290.5k
* errs: 60661, errxfer: 30330.5k, succxfer: 960.0k
+curr.rate: 650kB/s, avg.rate: 265kB/s, avg.load: 15.2%
dd_rescue: (warning): /dev/fd1 (31290.5k): Invalid argument!
repeated many, man times. I'm not sure why it says "Invalid argument!".
After all these attempts, there was a visible line on the coating of the floppy itself. I'm not sure, but I do not think it was there before I tried data recovery o this floppy. --[[User:Tingo|Torfinn]] ([[User talk:Tingo|talk]]) 20:42, 27 July 2016 (UTC)

Talk:ND-210628F - Revision history

Roger: /* Data recovery attempts */

Tingo: /* Data recovery attempts */ new section