I was wondering, if you change this value, does it affect the normal copy operation of windows also or just inside DOpus?
I explain, I had a very hard to pin point bug that took me months and lots of headaches.
I got some new WD My Book 6TB drives. The strange thing was that when I was copying or moving large data, the drive would disconnect after 40 minutes during the operation. Sometimes only after minutes.
Not to mention how hard this was. Thinking that it must be the drive that is faulty. I have 4TB drives with no problem.
Then I tried to do it directly with Windows explorer and the same problem happened and it made me think this is not DOpus but something more serious. It was also the time of Windows 10 and I had upgraded to Windows 10 which made me think maybe it's that.
By miracle I remembered I changed the copy_buffer_size value years ago. I use the profile restore so it always followed me. It was 1MB and I reset it to default 512 KB. Thank you for putting the changed values in Bold or otherwise I would not have noticed it.
Anyway, now all my disconnection problems are solved. My drive doesn't disconnect anymore.
Any idea why this would happen with 1MB buffer size on My Book 6TB drives only and not with the 4TB size?
The 6TB drives are faster, they copy at 120 MB/s. My old 4TB drives copy at 85 MB/s.
Also smaller drives copy 100+ MB/s, it has got nothing to do with the size. And USB-disconnects often are caused by high power-consumption (if the case has not an own power-supply), esp. on hubs, too large cables or bad PC-power-suplies.
There are some USB devices (usually memory sticks) that are sensitive to copy buffer size (probably just never tested with anything that doesn't write more than 64KB at a time or something), but as Jon says, the Opus copy buffer setting has no effect at all on any other software, so it's probably just a coincidence that changing that seemed to have an effect.
Sasa's suggestion of power consumption, and trying a powered hub, seems like a good thing to investigate.
Motherboard USB drivers are another thing to check on as both hardware USB drivers and the OS itself still have serious bugs even in recent versions, especially if the newer USB3 is involved. USB3 was very broken in Windows 10 for some hardware initially. Xyzzy's suggestion to try a USB2 port if it's USB3 is worth checking, if you still have problems with the latest drivers and OS updates.
Some USB hubs can also have firmware updates, which fixed problems for me where USB3 memory sticks wouldn't even show up when plugged into a USB3 hub I bought.
To avoid wrong results you should first connect the drive to the USB-ports directly on the mainboard on the back (not the front!). Also you should have a look if BIOS-/EFI-updates for the mainboard are available, which often fixes USB- and other issues.
USB3 is still a buggy thing, but according to my experience disconnects always were caused by too less power due to weak power supply, too long USB-cables, non-powered hubs or too many connected USB-devices (e.g. laptops often delivers full power only on the first USB-port).
Unfortunately I spoke too soon. The same problem still exists. The 2 drives are connected with USB3 directly to the back of motherboard and my system is top of the line new with a power of 850W and one graphics card only.
I have many My Books 3TB and 4TB drives. Somehow it happens only with the new WD My Book 6TBs. I have tried 4 of them on 2 different systems all with disconnects. I have no idea what and how to test and solve this.
My motherboard is Asus Z170 PRO GAMING with all the official drivers. The other computer was an ASUS laptop. Unless it's ASUS brand or Windows 10. All 4 where tested on Windows 10 ASUS machines.
Did you look for an EFI-upgrade? BTW do not install/use any ASUS USB-"boost"-drivers or something like that.
You could also try another USB-cable, disable power-management for the USB-device and disconnect all other USB-devices (except mouse/kb). At least you should be sure, that your power supply is not at its limit.
BTW there're some reports about this device interrupting connection or not being recognised.
My Bios is the latest. (then I visited their site and I see they have released new ones. They are releasing BIOS like bread. I had updated few weeks ago.)
Yes no USB Boost, I had enabled it at one time and had problems with WD Data LifeGuard Diagnostics. It reported errors on my drive. Then I disabled it and the drive was 100% OK.
The strange thing is that I bought 2 drives in one country and 2 other drives in a totally different country. Tested them on 2 different systems with same results.
Also here I ran the WD Data LifeGuard Diagnostics on my drives, Extended Test, it took 9 hours each with no errors and no disconnects.
The disconnect happens when you write between 2 drives and it's very erratic. Like it depends on the time of the day! Earlier today I had 7-8 disconnects in 10 minutes. Now I have none.
I'm just wondering if it's the speed of copying. I can't believe I'm asking this but is it possible to slow down the speed of copying? These new drives run at 130MB/s, my old drives with no problem at 85 MB/s. Anyway I can slow down the speed to 85 MB/s?
@Zodler: Yes, ASUS updates often, but better than never .
Why slowing down? The speed has nothing to do with the disconnects and the faster the better.
I have a 2-bay-case (self-powered), which I only turn when needed. But Win doesn't recognise it always (half of the time it works by simply deactivating and reactivating XHCI-driver, the other half I need to restart... reboot takes 4-5 secs, but it's irritating anyway). So I decided to buy an internal SATA-caddy with power-button... and sorry to say, but f... off USB3.0 ! Hotplugged SATA runs absolutely stable and I don't change HDD's much (most time the backup-HDD is in the caddy and if needed, I buy a 2nd one). I really use USB3.0 for drives now, which I use at different places, everything else is SATA now.
I have a similar problem (drive disconnect/sleep), but it is with windows 7, not DO.
I don't think it likes USB3, or maybe it is because it is an ASUS MB.
I would assume W10 is better in that regard, but I wouldn't be surprised if the OS/drivers
was partially responsible for the problem.
My fix?
When I need to use an USB3 drive, I attach it to a USB2 cable or port. In other words, disable usb3 for it.
It is slower, but at least the drive won't sleep/disconnect at random times, so it avoids destroying the drive
or data (flashdrives becomes readonly, regular disks get lost clusters, etc).
Some drives reported not to work with 7 and 3.0 (also the WD 6TB). I don't know if it's the mainboard or the drivers or the drive itself, maybe all together.
2.0? No option when copying/backuping giga- or terabytes! Fortunately disconnects (at customers) were always caused by to less power or too long cables.
[quote="Sasa"]Some drives reported not to work with 7 and 3.0 (also the WD 6TB). I don't know if it's the mainboard or the drivers or the drive itself, maybe all together.
2.0? No option when copying/backuping giga- or terabytes! Fortunately disconnects (at customers) were always caused by to less power or too long cables.[/quote]
I'm tempted to say "some drives might work with 7 and 3.0", because those seem to be few and far between.
If the drive is USB3/2 only and it fails in USB3 mode (iow, sleep/disconnect), there isn't alot of choice unless
you're rich and don't care about the data.
It would still be suited for archiving "slow data" such as media, because that won't require high read speed.
If it has alternative connections (ESATA, or whatever), that is obviously the way to go in this situation.
I simply wouldn't keep/use a drive that disconnects, send it retour and would try another one (also to find out if the drive or the PC is the problem). USB3-powered drives always should work (even my 2-bay-self-powered runs, but as said it sometimes needs a restart when powered on while sys is already running). And independed from speed... if a drive is designed for 3.0 and only runs with 2.0 I wouldn't copy data on it.
True, they should.
Like I said, the culprit may be (or almost certainly is in my case), the OS/drivers.
In my case I have ASMedia/Intel 7 series ports (ASUS P8Z77-Deluxe mb), and this issue seem to happen
regardless of port. After destroying a Kingstom 256GB (readonly), I kind of gave up, and found a use for
them instead.
A return would've been quite expensive as the retailer(s) won't cover transport back to them, and would
most likely find the drive to be working properly..depending on their hardware.
I would've tried to upgrade to W10 wasn't so riddled with integrated spyware you can't turn completely off
(their backported equalients aren't on this computer)..but even that might not fix it with my current hardware.
What about ASUS motherboards? Are they reliable? Because I see when people mention this, they also have ASUS motherboard.
What I did is that I have a cheap USB3 PCIe card. I connect one drive to my motherboard and the other to the USB3 PCIe card. For the moment no disconnects. That's why I ask if ASUS motherboards are considered good or bad?
@myarmor: Win10 doesn't collect less or more than 7 and the "additional features" can simply be disabled. That most things are activated if you choose express is another thing. And every smartphone collects more (if not using e.g. a custom Rom) than all Win-Editions together.
@Zodler: Asus may be involved in some USB3-issues (I also have 2), the Z-series got often updates involving USB, but as said I don't have any issues (except the one mentioned before) on both.
.