After a long haul fixing the Disconnecting and reconnecting bug well reported here and elsewhere now I find that sometimes connecting a 4 or 6 Terabyte external drive to a powered up laptop can cause severe drive corruption which running Windows Check drive for errors can not fix.

I have to leave the laptops powered up so as not to loose the playlist the client was running before my update.

The drive controllers are all those supplied by ICY BOX of Germany at one end and various makes of Laptops at the other, mostly Acer but some Sony, Asus and MSI makes and one Toshiba.   This problem can happen on any of them.   The external drive boxes are always powered down when plugged in and whole directory's containing many thousands of OTS DJ PRO media files can just 'vanish' never to be seen again.

This is happening to only about 2% of the drives in the fleet and it tends to be the same drives each time, but they re partition and format as normal and a Checkdisk surface scan has found nothing wrong.   The names of the drives are similar taking the format of iMS Media Disc 36 where 36 is a unique number between 1 and 42.

These media drives are replaced once a month with updated ones and I run an International Music Services company distributing licensed for playback in Public HD Music Video/Karaoke and Audio to Bars, Clubs, Hotels and other public venues around the World.

From what I have read so far on the Web it would seem that the USB3 standard is not being met fully by the competing manufacturers and us poor consumers are being left to pick up the problem and fix it on our own.   Any Ideas Gang???