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LTFSQuicktools failing to copy files to LTO-6 tapes

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Francis Newall
LTFSQuicktools failing to copy files to LTO-6 tapes
on Jun 13, 2017 at 10:56:26 am

Hi all,

Firstly many thanks for all of your help on these forums. I have never created an account before purely because I always find my question answered! This is a query that has been looked at before here but seemingly people have had new issues with it, and I'm wondering if it's a software update issue.

I use LTFSQuicktools software with an mLogic mTape Thunderbolt LTO-6 Drive. It's always formatted, mounted, written and unmounted just perfectly. However in the past couple of weeks I keep getting the following error when trying to write files to the drive even with a brand new formatted tape. (In this case, the total tape capacity is 2.41GB and available on the tape is 641.94GB, and the files I'm trying to write are 370GB in total):

"The item “[Project name here]” can’t be copied because it is too large for the volume's format".

Now I'm pretty sure this is an issue with trying to write files larger than 4GB to the tape. However, I believe I have written files larger than 4GB to the tape in the past?

Please find my log below, that doesn't seem to log any failure codes:

LTFS9015W Setting the locale to 'en_US.UTF-8'. If this is wrong, please set the LANG environment variable before starting ltfs.
50f LTFS14000I LTFS starting, LTFS version (8310), log level 2
50f LTFS14058I LTFS Format Specification version 2.2.0
50f LTFS14104I Launched by "/usr/local/bin/ltfs /Users/Silverfish/Desktop -o devname=0 -o eject -o sync_type=unmount"
50f LTFS14105I This binary is built for Mac OS X
50f LTFS14106I GCC version is 4.2.1 Compatible Apple Clang 4.1 ((tags/Apple/clang-421.11.66))
50f LTFS17087I Kernel version: Darwin Kernel Version 15.6.0: Fri Feb 17 10:21:18 PST 2017; root:xnu-3248.
50f LTFS14064I Sync type is "unmount"
50f LTFS17085I Plugin: Loading "iokit" driver
50f LTFS17085I Plugin: Loading "unified" iosched
50f LTFS12158I Opening a device through iokit driver (0)

50f LTFS12118I Drive identification is 'ULTRIUM-HH6 '

50f LTFS12162I Vendor ID is IBM
50f LTFS12159I Firmware revision is E6R1
50f LTFS12160I Drive serial is 10WT043924

50f LTFS12196I RESERVE_UNIT (0x16) returns -20601. (null)
50f LTFS12173I RESERVE_UNIT returns Not Ready to Ready Transition, Medium May Have Changed (-20601) (null)

50f LTFS17160I Maximum device block size is 1048576

50f LTFS17157I Changing the drive setting to append-only mode

50f LTFS11005I Mounting the volume

50f LTFS12207I Logical block protection is disabled

50f LTFS17227I Tape attribute: Vendor = IBM
50f LTFS17227I Tape attribute: Application Name = LTFS
50f LTFS17227I Tape attribute: Application Version =

50f LTFS17227I Tape attribute: Medium Label = LTO010
50f LTFS17228I Tape attribute: Text Localization ID = 0x81
50f LTFS17227I Tape attribute: Barcode = LTO010
50f LTFS17227I Tape attribute: Application Format Version = 2.2.0
50f LTFS14111I Initial setup completed successfully
50f LTFS14112I Invoke 'mount' command to check the result of final setup
50f LTFS14113I Specified mount point is listed if succeeded

LTFS Tools:Mount success

Any help would be hugely appreciated. I have an archiving backlog seriously building up and don't think I've encountered this in the past. Happy to post any more info or data!

Many thanks and kind regards,


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Jawad Mir
Re: LTFSQuicktools failing to copy files to LTO-6 tapes
on Jun 14, 2017 at 9:55:38 am

I have been backing up LTO6 tapes on LTO 6 back up system for 2 years. Never had this issue. All of a sudden I can't copy files as I get VOLUME IS TOO LARGE ERROR

I tried old tapes and same issues. Then I formatted them, same issue. I am 1 month behind backing up stuff

Any help would be appreciated

I am on Mac OSX 10.11.6

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Francis Newall
Re: LTFSQuicktools failing to copy files to LTO-6 tapes
on Jun 20, 2017 at 1:52:03 pm

Hi Jawad,

Desperately researching this, I managed to find the problem and it's a very easy fix!.

On this thread ( they mentioned exiting Adobe Creative Cloud, and now my 4+GB files are copying perfectly.

So it seems that by exiting Adobe Creative Cloud, you should no longer have any issues.

Many thanks and kind regards,


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