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  1. Retro 9.0.2 (107), on OS X 10.6 mini with 8 GB memory. tape drive is HP storage works Dat 72 usb I am trying to copy a media set from disk to tape. Total size is about 90 GB. On the second tape, I get errors. I've tried this 3 times, and the error is about the same. twice it has happened on the same file. Once on another file "nearby". Log excerpts: + Executing copy_iCompute_year at 12/7/12 (Activity Thread 1) To Backup Set v9_iCompute_2012t... - 12/7/12 5:43:14 PM: Transferring from v9_iCompute_2012 - 12/7/12 9:11:55 PM: Verifying v9_iCompute_2012t - 12/8/12 12:42:17 AM: Transferring from v9_iCompute_2012 - 12/8/12 4:22:35 AM: Verifying v9_iCompute_2012t !Backup Set format inconsistency (4 at 302823168) !Generated MD5 digest for file "Joy_HD_X/Users/cjl/Pictures/Bruce_9_13_09/Originals/2009/Jun 25, 2009/" does not match stored MD5 digest. !Backup Set format inconsistency (5 at 302822304) !Backup Set format inconsistency (4 at 302818176) !Backup Set format inconsistency (4 at 302817088) !Backup Set format inconsistency (4 at 302816064) (repeated many times....) previous + Executing copy_iCompute_year at 12/7/12 (Activity Thread 1) To Backup Set v9_iCompute_2012t... - 12/7/12 12:22:11 AM: Transferring from v9_iCompute_2012 - 12/7/12 3:51:42 AM: Verifying v9_iCompute_2012t - 12/7/12 10:42:37 AM: Transferring from v9_iCompute_2012 - 12/7/12 2:22:52 PM: Verifying v9_iCompute_2012t !Backup Set format inconsistency (4 at 302786496) !Generated MD5 digest for file "Joy_HD_X/Users/cjl/Pictures/Bruce_9_13_09/Originals/2009/Jun 26, 2009/" does not match stored MD5 digest. !Backup Set format inconsistency (5 at 312139968) !Backup Set format inconsistency (4 at 312262592) !Backup Set format inconsistency (4 at 332547344) !Backup Set format inconsistency (4 at 317140112) (repeated many times....) and previous... + Executing copy_iCompute_year at 12/5/12 (Activity Thread 1) To Backup Set v9_iCompute_2012t... - 12/5/12 1:40:33 PM: Transferring from v9_iCompute_2012 - 12/5/12 5:09:11 PM: Verifying v9_iCompute_2012t - 12/5/12 9:21:03 PM: Transferring from v9_iCompute_2012 - 12/6/12 1:02:50 AM: Verifying v9_iCompute_2012t !Backup Set format inconsistency (4 at 297431856) !Generated MD5 digest for file "Joy_HD_X/Users/cjl/Pictures/Bruce_9_13_09/Originals/2009/Jun 25, 2009/" does not match stored MD5 digest. !Backup Set format inconsistency (5 at 316160816) !Backup Set format inconsistency (4 at 316426624) !Backup Set format inconsistency (4 at 315258976) (repeated many times....) I already tried using a different tape. The first two were the same tape, the third try was a different tape (different manufacturer, too). After the second failure, I did a verify on the source media set, and it came through clean. This looks like some sort of bug to me. Tape is relatively imprecise in the face of errors and bad media. I would expect that if this were a device or media problem with recording the data, the error would change from run to run, but this is a little too consistent. I also would expect it to behave differently with a different physical tape. It would be nice to have timestamps on the errors. I could at least tell whether this is happening at the beginning, end, or middle of the tape. As it is, I have no idea. Writing these tapes takes hours. Despite all these errors, is any of the data written to these tapes retrievable? I'm inclined to treat the whole set as worthless if the copy process does not come through "clean". Is there some different procedure I can use to make this work?
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