Develop Bugs

[Q] USB OTB/Micro SD Card Reader

Question question regarding USB OTG Cables/Micro SD Card Readers. I know you can view content on them (movies, music, documents, etc). However, can you write to the flash drive/micro sd card? Basically, I'm curious because I know I could store roms on the flash drive or micro sd and play them from there, but I would like to store saves to it as well (so saves would not have to be stored on the Nexus 7).
I'm interested in the Meenova MicroSD Card Reader (I go for the card reader over a USB OTG because I do not need a large flash drive - a 64GB micro sdxc is sufficient), just curious if I can write to it as well or only read.
Thanks!

I've had no trouble writing to my Kingston 16GB SDHC through a usb reader.
The only thing I would mention is that you'll need a custom kernel to access NTFS file systems. Also you should note that the kernel in question needs to have write enabled for the NTFS module. This had me stumped when installing a kernel without it enabled, and it only ever mounted it read-only. Of course, if you're using FAT then you don't need to worry about any of this.

a9y said:
I've had no trouble writing to my Kingston 16GB SDHC through a usb reader.
Click to expand...
Click to collapse
I'm close to purchasing the Nexus 7 2013. The one thing holding me back is the USB drive issue. I want to be able to access the drive via the microUSB port and read&write to it like I would on a PC. You know, open an excel file, modify it, and close/save. All on the USB drive. Are you saying that can be done easily enough? I don't mind rooting, either. Don't want to but can if necessary.

Thanks. So from your post and reading a few other posts, unless you're rooted, you cannot write to NTFS (only read), but you can write to Fat systems. I really don't plan on having any files greater than 4GB so I believe Fat will work. Thanks!

[APP] USB Mass Storage for Samsung Galaxy SIII Mini

Hi everyone!
I was looking around for an app that could share my SD card with a computer via USB Mass Storage protocol, but no success. There were apps for other phones, but they didn't work for my phone :/ So I've created something for my own, and I hope it will work for your phones too. My app works only for external SD card.
REQUIREMENTS
* Rooted Samsung Galaxy SIII Mini (GT-i8190). This app may work for other devices too, but I can not guarantee that.
I have tested it against:
* Android 4.1.2, firmware JZO54K.I8190XXAMD3
* Windows XP SP3
* Windows 7 64-bit
Not working on:
* CM 10.1
KNOWN ISSUES
* USB PC Connection will still display MTP/PTP mode, even if the mode is Mass Storage. I could fix that issue, but this will require permanent configuration changes, which I would like to avoid.
* Other USB modes (especially ADB) are disabled during UMS mode. This can not be overcome.
USAGE
* Launch the application, click Enable UMS. This will unmount your external SD card from the device, and when the card is unmounted, app will switch USB mode. You should see two new drives appearing in My Computer window. On the second one, your SD card data should appear.
* When you are done, eject (unmount) the drive in Windows.
* Click Disable UMS. This will switch USB to the state it was before enabling UMS, so MTP/PTP mode, as well as ADB will be back. Then, your SD card will be mounted in the phone. An MTP Application prompt may appear, asking to restart MPT application. You may answer what you wish
IMPORTANT NOTES
* Never mount SD card in the phone (Settings->Storage->Mount SD card) while it is shared with a computer. This will cause the card filesystem to be mounted concurrently by two operating systems, and for sure cause data lost.
* Always eject (unmount) the card from a computer before disabling UMS.
* It seems that results (especially glitches and hangs) vary depending on the SD card you are using. See this post by myself.
HELP, THERE'S SOMETHING WENT WRONG
* You may restart your phone. The app does not make any permanent configuration changes, so it's the safest option.
* Restart your computer.
* Unplug and replug USB cable.
* You may try to disable USB, wait for several seconds, then either enable it again, or from the system USB PC connection app, change the mode to PTP, and back to MTP. Be patient, and wait before performing next operation.
* Be patient. From time to time, the computer takes a lot of time to detect device going back from UMS to MTP/ADB.
* App not working. Describe the symptoms (app crash, phone crash, computer crash, nothing changes, etc), your device details (operating system version and build) and attach logcat (adb logcat -d -v long > filename.txt) logs.
P.S.
I would kindly ask moderators to move this thread to the appropriate subforum, if it is already not. Since I'm newbie, I can not post to Developer's forum. Thanks

404 Error. Please upload again

burak185 said:
404 Error. Please upload again
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+1

burak185 said:
404 Error. Please upload again
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Click to collapse
There's something strange going on...
Please find attached app, I hope it will download
Edit: Still 404, since I can not paste external links (newbie), try http colon slash slash bogus.ovh.org slash UMSShare.apk

I tried UMS on XP and W7 but he did not work for me.When I want copy something, he says "copy..." and nothing happens.

sasa g said:
I tried UMS on XP and W7 but he did not work for me.When I want copy something, he says "copy..." and nothing happens.
Click to expand...
Click to collapse
Do you copy from the SD card, or to the SD card?
If you copy from, have you tried opening some files directly from the SD card? Do they open?
If you copy to the SD card, did you unmount it in Windows before disabling UMS?
I have just tried copying in both directions, and files do copy properly.

Hi f_ranek
App is working well, but hungs PC copying from PC to SD and vice versa with files more than 690 Mb, hope you could fix it, it will be very usefull, well known advantages from ums mode.
Thanks for your job.

Do not go on CM10
"Unfortunately the application was closed"

f_ranek said:
Do you copy from the SD card, or to the SD card?
If you copy from, have you tried opening some files directly from the SD card? Do they open?
If you copy to the SD card, did you unmount it in Windows before disabling UMS?
I have just tried copying in both directions, and files do copy properly.
Click to expand...
Click to collapse
From PC to SD card. PC says "copy...." and nothing happens.
Thanks

orwell 1950 said:
App is working well, but hungs PC copying from PC to SD and vice versa with files more than 690 Mb
Click to expand...
Click to collapse
sasa g said:
From PC to SD card. PC says "copy...." and nothing happens.
Click to expand...
Click to collapse
Actually, there seem to be some timeout issues. For instance, first I tried copying big files, and it seemed that everything hung, with strange Windows messages. So I disconnected USB cable, disabled and reenabled USM mode, and replugged USB. Then, I copied 40 MB to my SD card, but before the copying starts, I had to wait for a quite long time (about 30-60 seconds). But, surprisingly, after copying that 40 MB file, I have copied 80 MB file, 200 MB file and 700 MB file without any troubles and additional waiting! And they play well on the device. For your record: I was using Win XP SP3, and Total Commander 6.53. Tomorrow I'll try on Win7 64bit.
I'll try to tune a little the configuration, but have no idea if this will change something.

Chameleon. said:
Do not go on CM10
"Unfortunately the application was closed"
Click to expand...
Click to collapse
First of all, you are using quite unsupported by operating system. CM is Android, but is very different from the stock one, that device manufacturers put on their devices. Now, I have no plans for supporting CM - maybe find an app dedicated for CM, or ask CM developers to put back UMS mode natively, without any hacks. Because yes, UMS is still there, but hidden in UI, and all that UMS apps are doing is just guessing where and how, and hacking your OS.
Second, if you are using CM, it means that you are quite powerfull user. And I hope can read with understanding to install CM. So please read my post, and attach logcat (adb logcat -d -v long > filename.txt) logs. Sorry for my irony, but if you want to get help, you must first make a little effort.

f_ranek said:
First of all, you are using quite unsupported by operating system. CM is Android, but is very different from the stock one, that device manufacturers put on their devices. Now, I have no plans for supporting CM - maybe find an app dedicated for CM, or ask CM developers to put back UMS mode natively, without any hacks. Because yes, UMS is still there, but hidden in UI, and all that UMS apps are doing is just guessing where and how, and hacking your OS.
Second, if you are using CM, it means that you are quite powerfull user. And I hope can read with understanding to install CM. So please read my post, and attach logcat (adb logcat -d -v long > filename.txt) logs. Sorry for my irony, but if you want to get help, you must first make a little effort.
Click to expand...
Click to collapse
Thank you very much, inadvertently, this application works on 4.1.2 original stock

Hi everybody!
Recently I did some test with Windows 7 64 bit. The tests were performed on fresh system (the phone was plugged for the first time), the phone was plugged directly (no USB Hub down the line), and I've always switched to UMS before plugging the cable.
If you don't want to read such a long post, skip to the emboldened bottom line.
First, I've tested my regular SD card, 2 GBs labeled Kingston. I've copied 1 GB of files from the SD card to the computer, without any trouble and at average speed of 14 MB/s. Then I wanted to delete those files. After selecting them, and hitting Shift-Delete, I got delete progress dialog, which hung up leaving 1 file (out of 6) undeleted. At this point, access to SD card seemed to hung. I was unable to cancel the operation and close the dialog, as well as refreshing of the My Computer window took significant period of time. So I decided to unplug the USB, and replug it again. After that I noticed, that the files I wanted to delete are gone. Then, I copied back 700 MB file to the SD card. The copying avg speed was 3-4 MB/s, and the CPU utilization window (see here: http://forum.xda-developers.com/showthread.php?t=1495763) showed big blue bar.
Second, I replaced the SD card with another 2 GBs, labeled Japan. Then I copied 3 files (40 + 80 + 30 MB - no more space available, and no unnecessary files to delete) to the card. The copying was smooth, with little glitches before or after each file copying. The avg speed was 10-12 MB/s, and the device haven't indicate increase CPU load (neither green nor red or blue bars). Then, I tried deleting several files in a row from a directory, still without any glitches.
Edit: testing now, on Win XP, and through USB hub (does it matter?) does not work so perfectly well :/ I got one hang during folders deletion, and quite a long glitch before copying of several folders started.
Third, unlabeled 2 GB card sold (probably) with Nokia 6303i. First, I wanted to browse file system on the device. The performance was really bad, I was only reading files and traversing directories. Suddenly, all the file names changed to random characters (no writes performed by myself), and the phone indicated file system error, and unmounted the card. When I tried to share it with PC, windows said that the card is not formatted. The same phone, when trying to mount it back. The card can't be read neither on Nokia 6300.
Last, but not least - unlabeled 128 MB card got with my Nokia 6300 back in 2008. The phone indicated unformatted card, or unsupported file system. The same with Windows 7 accessing it with UMS, and Windows XP accessing it from the SD card reader. But, the card can be still read by my Nokia 6300, however, it's name is a little crapped. Moreover, I can access it from Windows XP using that Nokia in UMS mode!
So, the bottom line is
everything seems to depend on the SD card you are using.
Another story: the same micro SD card accessed via UMS in Nokia 6300 - very good performance, accessed via SD card reader with micro SD adapter - terribly bad performance. Another SD card accessed via the same SD card reader - very good performance. So as you can see, the same SD card, different reading devices - different effect. The same reading device, different cards - different effect.

Im not able to install on stock 4.1.2 i get problem parsing the package

[Q] File transfer using usb cable

Sorry if this has already been discussed, but I didn't found any answers regarding my issue.
So how can I transfer files from my pc using the pad's USB cable?
On my Sony phone with ics, it was enough to enable usb debugging mode and the pc sees it as a flash drive, using usb mass storage.
But here it seems there's no mass storage mode, only mtp and ptp which I don't like.
So what options do I have to actually see my 64 gb card when I connect the pad to the pc? Is it possible?
Cause even with debugging mode enabled it doesn't change anything, still have to use windows explorer and it's working very hard. Any help would be much appreciated.

Not sure I fully understand what's wrong with mtp option but I can fully see my 64GB card when connected to my pc via usb cable. I have successfully copied files to and from the SD this way with no issue. Explain what issue you may be seeing.

Usb Mode
gioni mnemonic said:
Sorry if this has already been discussed, but I didn't found any answers regarding my issue.
So how can I transfer files from my pc using the pad's USB cable?
On my Sony phone with ics, it was enough to enable usb debugging mode and the pc sees it as a flash drive, using usb mass storage.
But here it seems there's no mass storage mode, only mtp and ptp which I don't like.
So what options do I have to actually see my 64 gb card when I connect the pad to the pc? Is it possible?
Cause even with debugging mode enabled it doesn't change anything, still have to use windows explorer and it's working very hard. Any help would be much appreciated.
Click to expand...
Click to collapse
Can not see why you have any problems when my G Pad is connected I can see it as a device in My Computer " Not Devices " and when I open it up I see two drives. Internal and external SD card
Make sure you have loaded the LG USB Drivers
Plus it should come up with a list of what you want to do when connected click Open and view files

Thank you for the replies, guys.
Not sure if i made myself clear. Yes, my pc can also see my g pad device in My Computer, but it is not listed as a removable flash drive or an external hdd, thus i cannot see sd card properties, format options and so on. I usually use total commander for transferring files, because windows explorer is way too slow in doing this.
For example, if i want to download a movie or some songs directly to my tablet, how can i do that? With my sony phone is easy, my pc sees it as a removable flash drive, thus is easy to save files directly to it.
But with the g pad that option is gone, or at least i cannot find it. I must first download the files to my pc and only after that transfer them to my pad using windows explorer, which is really working hard. Basically, i have to wait one hour for downloading something, than another hour to transfer the files to my tablet, instead of downloading directly to the tablet.
And all this i believe is the effect of usb mass storage mode missing.
So in the end, is there an option to satisfy my needs?

gioni mnemonic said:
So in the end, is there an option to satisfy my needs?
Click to expand...
Click to collapse
In settings, go to "system", choose "PC connection", choose "media sync(MTP)".

MTP option does exactly what i was saying earlier, it only gives me the option to use windows explorer to transfer files.
It does not satisfy my needs, as i cannot save files directly to the tablet's SD card when downloading something, for example.
Can you people see the tablet's SD card as another DISK drive in your pc? With formatting options, sd card properties and stuff that you can do with a flash drive or an external hdd? This is my question, but i believe this is not possible.

Usb
gioni mnemonic said:
MTP option does exactly what i was saying earlier, it only gives me the option to use windows explorer to transfer files.
It does not satisfy my needs, as i cannot save files directly to the tablet's SD card when downloading something, for example.
Can you people see the tablet's SD card as another DISK drive in your pc? With formatting options, sd card properties and stuff that you can do with a flash drive or an external hdd? This is my question, but i believe this is not possible.
Click to expand...
Click to collapse
I have no problems it must be your USB drivers as mine sees it as a Device
I open mine up from my computer then open the SD card and transfer all my Movies and Pictures direct to the SD card I can open up files on Device or Card

Hi again, i've attached some print screens with the issue i'm trying to explain. The main thing that bothers me is the clearly slower speed for transferring files using windows explorer. With total commander it goes almost double the speed rate. Plus, why should i download a file to my pc instead of downloading it directly to g pad's sd card? Waste of time in my opinion.
But recently i did read somewhere that jelly bean does NOT support usb mass storage, so i guess that answers my question.

[Q] Problems using Galaxy Tab S as USB device

I have purchased a week ago a Galaxy Tab S 8.4 (T705M) and I am using a 64 Gb MicroSD in it.
I upgraded to 5.02 (OTA) since June/26.
I have problems with external MicroSD when the tablet is connected via USB to my PC (Windows 7, Home, 64 bits).
Whe trying to copy files from the PC to the tablet external MicroSD, the operation is very, very slow and some files (existing previously in the external MicroSD) disappear. Very annoying.
I had same problem with another Tab S I purchased by January and I returned it to the vendor. In that case, the tablet was on Kit Kat (as it is sold).
Yesterday, after the Tablet erases several directories from the SD, I turned off the tablet and extracted the SD. I tried to fix the SD directly connected to the PC but the SD appears as "read only".
After trying for a while I gave up and I formatted the SD (extFAT) and copy the info from a backup I did before putting the SD in the teeth (fangs?) of the tablet (yeah, I guessed the tablet would be as a wild beast when managing SD's). The "re"formatted microSD behaved as a charm, all info copied without any problem (but it took almost 3 hours copying 50 Gb at about 7 Mb/second).
On the other hand, I used this same SD card in my old Note 8 (Jellybean) for more than a year without problems.
Now, I guess the only way I have is extracting the SD card and edit its content only connecting it directly to a PC.
What can I do to calm down the beast and edit external MicroSD connecting the tablet via USB without losing information and with a reasonable speed ?
Any suggestion ?

Root your device and apply the sd card fix. Also 7mb/s seems about normal for a cheap micro sd card.

I have not had any problems with files disappearing, have you confirmed your 64gb microsd is not a fake.
I have a Samsung 64gb microsd, and i got around 9MB/s copying a movie from my notebook to my T800 10.5"
John.

Thanks for the comments.
My card is Verbatim Class 10 and it worked perfectly in my old Note 8. It works really as stated for a class 10 SD (10 MB/s at peaks as stated in https://www.sdcard.org/developers/overview/speed_class/) but, as with any device, speed depends on several factors (file sizes, buffer in the source PC, etc) and the average obtained is really about 7 MB/s or so.
I guess the problem is related with something in Lollipop (but Tinderbox says has no problems) or, more probable, driver in the PC.
Tinderbox, are you using Kies to transfer ? are you transferring from a PC or a Mac ? which class is your SD ? have you enabled "USB debugging" ?
I purchased an 8 GB SD in order to make some tests. This SD is Class 4 and formatted FAT32 but anyway I will test it to learn about this riddle....
In the mean time, any suggestions are welcome and I repeat, thanks for the answers.
UPDATE:
Sandisk SD (8 GB, FAT32) worked perfectly, no erases, good speed (Class 4, speed tablet connected via USB about 4 MB/s).
Next test planned: reformat Verbatim 64 GB using FAT32.

I am on kitkat 4.4.2 and i dont use kies, I just drag and drop my files from my notebook to the tablet, I did not need to enable usb debugging, my 64gb is full of video, I copy them virtually every day and have had not problems.
I think i read about another 8.4" owner having problems with his microsd card i will have a look for it.
I have only ever bought Samsung memory cards for years and i have never had a problem.
Have you tried re-installing the device driver, you can do it from the kies menu.
John.

Tinderbox (UK) said:
I am on kitkat 4.4.2 and i dont use kies, I just drag and drop my files from my notebook to the tablet, I did not need to enable usb debugging, my 64gb is full of video, I copy them virtually every day and have had not problems.
I think i read about another 8.4" owner having problems with his microsd card i will have a look for it.
I have only ever bought Samsung memory cards for years and i have never had a problem.
Have you tried re-installing the device driver, you can do it from the kies menu.
John.
Click to expand...
Click to collapse
Thanks for your complete answer(s).
I have made several (a lot) of tests without any success. In all cases SD can not be written from a PC (when connected via USB) and erasing files using android app sometimes cause corruption.
The card is completely readable (a little laggy to begin to work after it was unmounted and reinserted). The card works without errors when connected directly to the PC.
These are the some tests I have made (reformatting and restoring the files between one test and the next, a real nightmare ):
1. Uninstalling Kies
2. Reinstalling Kies (and refreshing driver)
3. Uninstalling Kies and Samsung driver. Uninstalling USB driver and erasing it completely and let windows select the driver
4. Formatting the card in FAT32 via some software
5. Trying to format the card via command in windows (from the console). It takes about one hour and abort near the end with an error messages explaining that windows can not format FAT32 for this capacity
6. Even trying to partition the SD via DISKPART. I can create one primary partition (32000 MB) but DISKPART shows all disk allocated and do not allow to create another partition (either primary or extended)
Last symptom: I erased one file from the root directory of the SD using "My files" (the app preinstalled in the firmware by Samsung). The file disappear but My files shows a ghost file named with special characters.
When the SD is consulted via Root Explorer (an android file manager) or even connected directly to the PC, the ghost file did not show.
@tinderbox: could you remember who (or where do you read about) the other " 8.4" owner having problems with his microsd card " ?
Some body could suggest solution ?
Thanks for any help or guide.

Hi.
You did format the micosd card using the tablet, you cannot format on an computer and then use it in your tablet, the tablet uses it own file system, so you have to format the microsd using the tablet.
John.

Format the card to exFat in windows. It only takes a few seconds to format my Samsung Evo 64gb.
If it doesn't work then your card likely has issues.

Finally success
Thanks for your suggestions.
I tried almost everything:
1. Formatting FAT32
2. Reformatting in the tablet
3. Reformatting in the PC
4. Even formatting using a software from Verbatim website
The problem persists: SD Card is not editable (delete files, write files, edit files) when inserted in the tablet. SD works perfectly in the PC.
Finally I purchased another SD 64 Gb Toshiba Class 10. The SD package says it can work at 40 Mb/sec. The card write at 10 Mb/sec but it reads faster.
This Toshiba card works perfectly. I can erase or move files using android file manager (My Files app), I can write from the PC using tablet connected via USB to the PC. I can create files directly in the tablet (I used Jota+ to create a text file).
Verbatim card and Toshiba card specs seem identical, except by the speed claimed in the Toshiba package. There is some difference I am missing but definitively these cards are not equal (something in the card data bus ?)
I repeat, thanks to everybody who tried to help.

I only ever buy Samsung memory cards for years, and i test every one for errors and i have never found any, And if an Samsung memory card does not work in an Samsung tablet, well it is not going to happen, but people go for the cheap alternative.
John.

Big data transfer via OTG failed

Hi guys, when I try to move big data (movies bigger than 8GB) on USB stick via OTG that was in the box, it always fails.. Smaller files can be transfered ok. Does anyone has the same problem? Also the transfer is quite slow.. is the OTG usb 2.0 or 3.0 speed?

I think is because of the file size limit.
For example, most USB sticks, when formatting it, have the option of choosing the file block (I don't know how it's called exactly) between 4GB or 8GB. And if you choose the 4 GB and the file is larger (say 5GB) you won't be able to transfer it.
I think you have the same issue.
If it's a single file, try either uploading it to Google Drive or archiving it to bring it below the 8GB mark.

I think its not the problem. Transfering big files from pc to usb stick is ok. I'll try to format it and do some more googling. Thanks anyway