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 Fitlet reboots when attaching external drive 
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Joined: Tue Jun 23, 2015 6:02 am
Posts: 6
Post Fitlet reboots when attaching external drive
I have a 2TB SSD (using this: dual-msata bay with 2 1TB mSata SSDs) that I want to connect to my fitlet via an external enclosure.
However, upon insertion the fitlet immediatly reboots. After booting, the disk is detected and working. Initially I tried this via the eSatap port, but the same thing happens using usb 3.0 (or 2.0). The same disk does work on my laptop (both with eSatap and usb 3). And other 2.5" external drives do not exhibit this behavior when inserted into the fitlet. Leading me to conclude that it's due to a combination of the constructed 2TB SSD and the fitlet.

The most likely suspect to me seems that the fitlet can't draw enough current to power both mSata disks at the same time, while also otherwise fully powered.

I can think of two possible solutions:
1. Try to use a sata -> usb 3 + usb 2 cable. This would distribute the load over two usb ports. Not sure if it would help though. But this would be the easiest solution for me.

2. Power the SSD externally with 5V. This should work but I'm not sure if mixing power from different sources could become a problem.

Any ideas on the matter would be appreciated.

Tue Jun 23, 2015 6:27 am
Post Re: Fitlet reboots when attaching external drive
Can you please explain how do you connect this mSATA to 2.5” SATA adapter to the fitlet? Is there a SATA/USB3.0 bridge?
The adapter itself can be a reason for such behavior as it impose additional electric element in the network. Maybe it doesn't support hot swap protocol and reboots under such conditions.

Your assumption is logical as well, fitlet is a low power system, so that powering two SSD devices, when one of them is really large in size - 2TB can be an overload conditions. Current consumption can be checked in this 2TB storage datasheet.

The best way to verify that is as proposed, to try connect this storage via other adapters. There are adapters that features connection to 2 USB ports. In terms of power sourced from 2 different USB ports, should not be a problem.

Thu Jun 25, 2015 8:58 am

Joined: Tue Jun 23, 2015 6:02 am
Posts: 6
Post Re: Fitlet reboots when attaching external drive
Thanks for the reply.

The SATA->eSATAp I used was this thing:
Which should really support hot-swap. This one failed very consistently.
The SATA->USB3.0 were various external harddisk cases, which did work properly with regular 1 TB SSDs.

I've since also tried external cases which featured a cable with miniUSB -> 2 USB 2.0 connectors and one with a USB 2.0 and eSATA connector. Both worked rather inconsistent depending on which USB ports (USB 3.0 generally caused reboots more often) were used and in what order they were inserted. There were also some cases where attaching during boot up didn't cause a reboot while doing so when in windows did.

I ordered a SATA->USB3.0+USB2.0(for power), which should hopefully solve the problem and provide the desired speed. I'll post an update when I've tested it.

Mon Jun 29, 2015 8:36 am

Joined: Tue Jun 23, 2015 6:02 am
Posts: 6
Post Re: Fitlet reboots when attaching external drive
Unfortunately the sata->usb2 + usb3 solution didn't work, same issue.
An obvious workaround is to connect the usb2.0 to an external power source, but that's not really an option for me.

Luckily Samsung released 2TB SSDs this month, so I'm going to look at those.

Thu Jul 09, 2015 2:11 pm

Joined: Thu Jul 30, 2015 10:29 am
Posts: 1
Post Re: Fitlet reboots when attaching external drive
I have the exact same problem. When I plug in (VIA USB3 hub and RealTek 8153 USB3/Ethernet converter) into one of the USB3 ports, the fitlet-XA10-LAN resets immediately.

I also suspect that the voltage drops in that moment, but I have no scope to verify. It works when I plug it into the USB2 ports.

Not great, but I can deal with this for now... just wanted to share my experience.

Thu Jul 30, 2015 10:34 am

Joined: Sun Aug 09, 2015 1:06 am
Posts: 3
Post Re: Fitlet reboots when attaching external drive
Would a more robust power supply solve this problem? What about a powered usb hub? (Are they still a thing with usb 3.0?)

I've experienced a lesser problem on fitlet-i and MintBox Mini... With a usb flash drive connected, I then have to use a little trial and error to find working ports for the keyboard and mouse.

Sun Aug 09, 2015 1:54 am
Site Admin

Joined: Mon Mar 16, 2009 2:11 pm
Posts: 2340
Post Re: Fitlet reboots when attaching external drive
We acknowledge fitlet sensitivity to USB current draw. We will redesign the USB overcurrent protection in the next fitlet revision.
It does not appear to be a problem that can be resolved by a different fitlet PSU.

Irad Stavi
fit-PC forum admin


Sun Aug 23, 2015 2:18 pm
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