Interesting Ak.Sys dropout story (dump the hub?)

Last weekend Ak.Sys freaked out during a short data copy from PC to MPC. It needed a logoff or reboot of the PC to get Ak.Sys working again. But during the next copy session the problem repeated. Ak.sys crashed during the copy process. This repeated on and on, and I tried tens of times, over a period of 1-2 hours.

So I wondered what went wrong, since I had successfully copied about 1.5 GB to the 4k, a couple of weeks ago. But I rember it failed the first time, and worked the second time. Something was on the edge of failing maybe...

First thing I tried was pulling all other USB cables from the PC, so that only the USB cable between PC and 4k was inserted in the PC's USB ports. No luck. Same hangups.

Then I decided to replace the cable between PC and 4k with another one, bypassing a USB hub. This worked! Copying now worked flawlessly for the rest of the day, for many, many hours and I copied tons of to the 4k, in tens of copy sessions. I also noticed that the max speed increased from around 580 k/s to around 625-ish.

So I now suspect the USB hub that is normally placed between PC and 4k. Maybe the hub has bugs (there's software in there!) that pop up when huge amounts of data are transmitted. Maybe the hub introduces a new kind of message during stress (e.g. reporting a failed data package) that Ak.Sys cannot handle. Maybe the hub introduces delays (during stress) that trigger a timeout situation in Ak.Sys. I don't know really.

Whatever the reason, the hub is history!

Rob wrote:Last weekend Ak.Sys freaked out during a short data copy from PC to MPC. It needed a logoff or reboot of the PC to get Ak.Sys working again. But during the next copy session the problem repeated. Ak.sys crashed during the copy process. This repeated on and on, and I tried tens of times, over a period of 1-2 hours.

So I wondered what went wrong, since I had successfully copied about 1.5 GB to the 4k, a couple of weeks ago. But I rember it failed the first time, and worked the second time. Something was on the edge of failing maybe...

First thing I tried was pulling all other USB cables from the PC, so that only the USB cable between PC and 4k was inserted in the PC's USB ports. No luck. Same hangups.

Then I decided to replace the cable between PC and 4k with another one, bypassing a USB hub. This worked! Copying now worked flawlessly for the rest of the day, for many, many hours and I copied tons of to the 4k, in tens of copy sessions. I also noticed that the max speed increased from around 580 k/s to around 625-ish.

So I now suspect the USB hub that is normally placed between PC and 4k. Maybe the hub has bugs (there's software in there!) that pop up when huge amounts of data are transmitted. Maybe the hub introduces a new kind of message during stress (e.g. reporting a failed data package) that Ak.Sys cannot handle. Maybe the hub introduces delays (during stress) that trigger a timeout situation in Ak.Sys. I don't know really.

Whatever the reason, the hub is history!

I"ve been having trouble copying my harddrive to the computer as well with OS 1.70.
Ak.Sys keeps crashing. I go directly from laptop to the MPC 4000, so no hub. I'm about to report it to Akai ,and then downgrade my OS 1.60 and do the backup and then up the OS back to 1.70. That's about all that I can figure out.


Dave

My craps out on me all the time, no HUb, Mac g5

yea mine has sucked on l arge transfers forever w/o a hub. I have yet to do large transfers with 1.70 though

Mine's a P3 500mhz Laptop that I have dedicated for Ak.Sys, when I feel like starting a computer up in my studio. I didn't have this problem with prior OS', so will be downgrading
1 by one , until I can transfer my files over. I'll update this thread with which OS
was successful.


As the OS 1.70 indicates that they've fixed this, we might be seeing a bug out of their
code fix.


Does anybody know if Ak.Sys does any type of logging that I can check to see which file
it was transferring when it crashed. If I could get a reproducible test case, then I'd send it along with the Bug report.

Dave

i did a 20 giga backup back on either one of the 1.51 betas or 1.60 - cant remember - but it was a nightmare - it took 3 entire days from early mornin til late night. maximum transfer was about 200-300 mb at a time time then it crashed somewhere. on 1.70 i did 3 major backups - once about 500 mb, once 1,5 giga and once over 2 giga and it never crashed .... dunno - seems workin real good for me as it is now (backin up on a pc runnin xp - pentium 2,8 ghz, 1 giga ram) ... yo - never used hubs though - good luck you all