Two external disk with HUB Question

[stevejc]

Hi, I have a hub that have 3 ports.

I try to connect one hard drive and a USB stick on the OTG port, the HUB is powered on.

Separately, I have got no problem.

But together, the tablet (M8HD) mounts only one external USB.

Does someone know how to do it ?

I have tried all the applications like OTG helper without success.

Thanks

[M9ProPipo]

mount two external drives

I imagine you'll have to make a new directory in /mnt then from a Terminal command prompt use the Linux 'mount' command to manually connect the second drive. I haven't tried 2 drives, but multiple partitions (not fat32) on the same physical drive was possible for me that way.

If dmesg works check the end of that for clues about the /dev/ device name to connect to.

You have to mannually umount it from the command line when done. ('sync' first)


See 'man mount' for more options than you'll need.

[dibnah]

You might also have an issue with powering the hub. You really need to have a powered hub.

[stevejc]

So finally, I get it.

But I need to do it with adb, because in terminal editor, the others apps don't see the mounted volume.

I plug the hub then my USB hard drive (NTFS one)

This one is automatically monted by the system in mnt/usb_storage

Then I plug a FAT usb Stick.

with dmesg, I see that its name is sdb1.
You see also in /dev/block

So you create a directory in /mnt/sdcard/usb or in /mnt/usb (you need to have file system read write for this)

Then mount your drive in adb :

mount -t vfat /dev/block/sdb1 /mnt/usb

or with same option as the tablet does :

mount -o dirsync,nosuid,nodev,noexec,utf8,uid=1000,gid=1015,fmask=0002,dmask=002,allow_utime=0020 -t  fat /dev/block/sdb1 /mnt/usb

Then I can see files in /mnt/usb

It's OK for this but I can't achieve the opposite !
Plug the FAT USB (automatically mounted) then NTFS hard disk.

I can't mount it, I see the NTFS volume in /dev/block but the following commands don't work.

mount -t ntfs /dev/block/sdb1 /mnt/usb2
or
mount -t ntfs-3g /dev/block/sdb1 /mnt/usb2
or
ntfs-3g /dev/block/sdb1 /mnt/usb2

So if someone knows, thanks