Is my Airport Extreme corrupting my drives?

I've read a number of Apple Discussions about issues similar, but not quite the same, as the one I'm having. It's driving me mad because I can't pin down what's wrong to find a fix.


The drives I have attached via network seem to corrupt over time. Last year it was the 1TB, this year the 3TB has been acting up (and 2 weeks ago the *other* 3TB was completely freaked out - missing 1/3 of its files - and had to be wiped (it has the identical content to the 3TB MiniStack because I am resigned to a cycle of wiping and re-installing at the moment).


Example of problem: Currently I have 421 files on one of the 1.5TB partitions. They are absolutely there. When the drive is connected directly to my Mac, I can see them all and it says 421 files. When I put that drive on the network, it says it has 419 files. If I attempt to drag one of the "missing" files from my Mac to that drive, it tells me there is already a file by that name in existence and asks if I would like to replace it. So, on some level that file is being recognized even though via network it's not in the file count, it's not showing up in iTunes, and is not showing up in the Finder.


Last night I was also randomly getting a -50 error when trying to move a file onto that drive via network, and I got several disconnect messages even though the networked drives were all still visible and accessible from my Mac. I've gotten those disconnects randomly before, but not in that number. I'm not getting that this evening, though the file there/not there issue is still with me.


The "missing" files are the last 2 alphabetically (one is a folder, one is an m4v file, both start with Z). When a partition on the other 3TB drive melted down, most of the missing files were in the H's and A's (movie files). I can't figure out a reason for that but it does seem weird. In previous disappearing file scenarios, it's not the same two that are missing now, so I don't think it's a bad file. The other partition on that drive seemed OK.


I've swapped drives (including some not mentioned here), changed the order in which they are plugged in, changed cables, it happened in 10.5 and now in 10.6.8, it's not iTunes because, while it can't see the files, neither can the Finder. The only thing that hasn't changed is the Airport Express Base Station, which makes me wonder if it's corrupting things. Is that even possible?



I ran Sophos on every drive I own - all are clean. I ran Disk Utility on these 2 networked drives and they both checked out fine right now (2 weeks ago the previously corrupted 3TB was irreparable, as were disks before it, thus the constant wipe/restore cycle. I suspect I'm heading down that path again.)



I have been plagued by this for at least 2 years now. Perhaps because I'm trapped in the house from a blizzard, I'm motivated to fix this annoyance once and for all instead of wipe/reinstall/repeat every 6 months. The idea of streaming my movie, tv and music library from the basement (leaving that wire-y mess down there) to my Macbook is nirvana for me. Apple's marketing makes me believe it can happen via Airport Extreme. What am I missing? Am I asking too much from networked drives and would having an old Mac hooked up as a server work better?



Help! :-)


My setup:



Airport Extreme base station 802.11n (3rd Generation) w/version 7.6.1


USB attached drives - AEBS directly connected with NewerTech MiniStack Classic 3TB w/powered hubs, divided into 2 1.5TB partitions. Attached to the MiniStack Classic via USB is a MiniStack v3 1TB drive (the other 3TB mentioned above is an OWC Mercury Elite).


Airport AND drives are plugged into an APS battery back up, so even when the power hiccups here, they don't lose power.


My computer is a Black Macbook with 10.6.8 and iTunes 10.7 (staying put because I like the flip-through-the-artwork feature, and this doesn't seem to be an iTunes problem).

MacBook, Mac OS X (10.6.8)

Posted on Jan 8, 2014 4:04 PM

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6 replies

Jan 15, 2014 1:02 PM in response to Maureen_ McCarty

😕 No clues?


I've tested out some things in the past week, but haven't found a fix. I can now compare with 2 Macs, but the problem appears on both. I used one as a server and attached it to the AEBS and with that setup all the files appeared fine, so it seems to be something with the USB on the AEBS (and I read some threads about needing to use powered drives and hubs and these are powered, so I guess that's not the problem).


Is it normal for the "get info" info to differ when reading a disk via direct attachment or via server versus reading it when it's attached via USB on the AEBS? There's a big discrepancy in those readings on every drive I attach and I wonder if that is a clue to fixing this or if that's normal.



I've contacted the drive manufacturer as well, and they're interested in what's going on with this - but don't have any solutions.

Jan 17, 2014 1:11 PM in response to Maureen_ McCarty

I did discover a way to make all 421 files show up! I made a new folder on the partition giving me problems, and dropped all the visible files into it. As soon as I did that, the 2 missing files appeared. That would seem to indicate a number-of-files limit except for the fact that in the other partition that number doesn't apply.


I had 54 files on that partition, and I copied over an additional 400 to see if I'd only see 419. Once again, there were 2 missing files, but that means I see 452 instead of 454. And weirdly enough, it's not the last two files, but rather the first newly-copied file and the last pre-existing folder that are now not visible. They are still there (as a search finds them) but that's the only way they're found.


I wondered if partitioning caused any issues so I tried this out on my 1TB Ministack v3, and got the same result. again it was exactly 2 missing files (but these were not sequential in the list, one was one of the first added, and one in the middle). What's consistent:


1. It's always 2 missing files (not necessarily the last ones in the list)


2. It's limited to the root level of a drive. A folder that I put 425 items in has 425 items. If I do that at the root level, it shows 423.


3. It only happens when the drives are connected via USB to the Extreme. Since this is something advertised by Apple as a supported use, I don't understand why it doesn't work (I've seen the numerous threads about TimeMachine issues... that is *not* what I'm doing).



I seem to be having a conversation with only myself here, but I'll keep trying anyway. There has got to be someone with an idea of what the issue is so I can try and fix it. At the moment, I'm looking at getting a Mac for a traditional server and warning anyone I come across to avoid connecting a USB drive to an Airport device unless they enjoy losing data and/or re-formatting drives every 6 months.

Jan 18, 2014 10:27 AM in response to Maureen_ McCarty

I have narrowed it down to the number of files needed to make the bug/feature happen: 194. If there are 194 files or fewer at root level, all is well. If I go to 195 one disappears. If I go to 196 or more, then 2 disappear (only 2, never more, never less no matter how many more files I add).


They are always the same two files (that's relative... when testing with my normal files it was always the last 2 Z-named files, when testing with text docs I made it was always the first copy and copy 99 on one partition, it was a Z-named file and the first copy on the other partition). What's really bizarre is that as I'm deleting test files, the "missing" files will briefly show (literally for a second) and then disappear again. The file count at the bottom of the finder window changes too.


I can see this behavior on 2 Macs but as both have Snow Leopard 10.6.8 I can't count out that being a factor in this miscommunication.

Mar 31, 2014 2:58 PM in response to Maureen_ McCarty

Maureen, I just found your post while researching drive corruption issues. I had a possibly related problem with drive corruption on a new Airport Exreme tower. The drive is 1TB WD if I recall correctly in a OWC quad i/o powered case, with two partitions. One partition containing a handful of files got corrupted and I needed to restore files from a backup. Unfortunately I can't offer more details at present, but I am setting up a shared repository and want to make sure I do not get everything set up and have recurring issues like this. I hope you've found an answer and will check in if I discover anything new. Regards

Mar 31, 2014 4:04 PM in response to Skytouch

Well, I guess that means it's not limited to my older model of Airport Extreme. 😀 I never did find a solution, other than to not attempt to use a drive connected via USB as a network drive. I went oldschool and have an older Mac Mini hooked up as a server with the drives attached to it. The Mini is attached to the Extreme, but having it hooked up this way avoids the "missing file" issue, and hopefully the corruption. It took months to show up, so I'll know by Fall if that takes care of it (I can't imagine why it wouldn't).


Good luck with yours!

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Is my Airport Extreme corrupting my drives?

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