I was copying some files to a NTFS stick (that had been used before heavily).
When trying to unmount, the writing of data never finished, so I reset the
computer after having waited a long time (and iotop showed no writes).
In Windows 7 some of the files looked incomplete or damanged.
When mounting the stick on Linux again (to recopy the files), I saw these
messages in syslog:

### mount
Feb 25 08:31:52 pc ntfs-3g[9036]: Mount options:
rw,nodev,nosuid,uhelper=udisks2,allow_other,nonempty,relatime,default_permissions,fsname=/dev/sde,blkdev,blksize=4096
Feb 25 08:31:52 pc ntfs-3g[9036]: Global ownership and permissions enforced,
configuration type 1
### unmount (attempt)
Feb 25 08:32:06 pc ntfs-3g[9036]: Unmounting /dev/sde (STORE_N_GO)
### another mount
Feb 25 08:32:11 pc ntfs-3g[9070]: Version 2013.1.13 external FUSE 29
Feb 25 08:32:11 pc ntfs-3g[9070]: Mounted /dev/sde (Read-Write, label
"STORE_N_GO", NTFS 3.1)
Feb 25 08:32:11 pc ntfs-3g[9070]: Cmdline options:
rw,nodev,nosuid,uid=1000,gid=100,uhelper=udisks2
Feb 25 08:32:11 pc ntfs-3g[9070]: Mount options:
rw,nodev,nosuid,uhelper=udisks2,allow_other,nonempty,relatime,default_permissions,fsname=/dev/sde,blkdev,blksize=4096
Feb 25 08:32:11 pc ntfs-3g[9070]: Global ownership and permissions enforced,
configuration type 1
### unmount again
Feb 25 08:32:23 pc ntfs-3g[9070]: Unmounting /dev/sde (STORE_N_GO)
Feb 25 08:37:38 pc ntfs-3g[9261]: Version 2013.1.13 external FUSE 29
Feb 25 08:37:38 pc ntfs-3g[9261]: Mounted /dev/sde (Read-Write, label
"STORE_N_GO", NTFS 3.1)
Feb 25 08:37:38 pc ntfs-3g[9261]: Cmdline options:
rw,nodev,nosuid,uid=1000,gid=100,uhelper=udisks2
Feb 25 08:37:38 pc ntfs-3g[9261]: Mount options:
rw,nodev,nosuid,uhelper=udisks2,allow_other,nonempty,relatime,default_permissions,fsname=/dev/sde,blkdev,blksize=4096
Feb 25 08:37:38 pc ntfs-3g[9261]: Global ownership and permissions enforced,
configuration type 1
### Some strange USB problems:
Feb 25 08:41:10 pc kernel: usb 5-3: reset full-speed USB device number 3 using
ohci-pci
Feb 25 08:41:10 pc kernel: usb 5-3: reset full-speed USB device number 3 using
ohci-pci
Feb 25 08:41:10 pc kernel: usb 5-3: reset full-speed USB device number 3 using
ohci-pci
Feb 25 08:41:11 pc kernel: usb 5-3: reset full-speed USB device number 3 using
ohci-pci
Feb 25 08:41:11 pc kernel: usb 5-3: reset full-speed USB device number 3 using
ohci-pci
Feb 25 08:41:11 pc kernel: usb 5-3: reset full-speed USB device number 3 using
ohci-pci
Feb 25 08:41:12 pc kernel: sd 11:0:0:0: [sde] FAILED Result: hostbyte=DID_ERROR
driverbyte=DRIVER_OK
Feb 25 08:41:12 pc kernel: sd 11:0:0:0: [sde] CDB: Write(10) 2a 00 00 f4 7f 88
00 00 f0 00
Feb 25 08:41:12 pc kernel: blk_update_request: I/O error, dev sde, sector
16023432
Feb 25 08:41:12 pc kernel: Buffer I/O error on dev sde, logical block 2002929,
lost async page write
Feb 25 08:41:12 pc kernel: Buffer I/O error on dev sde, logical block 2002930,
lost async page write
Feb 25 08:41:12 pc kernel: Buffer I/O error on dev sde, logical block 2002931,
lost async page write
[...]
### another unmount attempt
Feb 25 08:42:13 pc ntfs-3g[9261]: Unmounting /dev/sde (STORE_N_GO)
### Here i tried a shutdown (which hung), then a reset

### After having mounted the stick in Windows 7
Feb 25 09:05:59 pc ntfs-3g[3061]: Version 2013.1.13 external FUSE 29
Feb 25 09:05:59 pc ntfs-3g[3061]: Mounted /dev/sde (Read-Write, label
"STORE_N_GO", NTFS 3.1)
Feb 25 09:05:59 pc ntfs-3g[3061]: Cmdline options:
rw,nodev,nosuid,uid=1000,gid=100,uhelper=udisks2
Feb 25 09:05:59 pc ntfs-3g[3061]: Mount options:
rw,nodev,nosuid,uhelper=udisks2,allow_other,nonempty,relatime,default_permissions,fsname=/dev/sde,blkdev,blksize=4096
Feb 25 09:05:59 pc ntfs-3g[3061]: Global ownership and permissions enforced,
configuration type 1
Feb 25 09:06:01 pc ntfs-3g[3061]: ntfs_mst_post_read_fixup_warn: magic:
0x00000058  size: 4096   usa_ofs: 2  usa_count: 65535: Invalid argument
Feb 25 09:06:01 pc ntfs-3g[3061]: Actual VCN (0x2000000001a55) of index buffer
is different from expected VCN (0x0) in inode 0x1803.