slow usb-c transfer speeds, reliability and Files app bugs, iPad OS, iPad Pro 2018

I've been experiencing unexpected and buggy behaviour of Files app when copying data from and to an external storage media.


iPad OS 13.1.1 and 13.1.2


Files app bugs:

  1. ExFAT formatted drives (both ssd and hdd) cause problems: files copied to external media not visible in Files app. Files app hangs and refuses to recognize drive after leaving current directory while file is being copied
  2. usually SLOW (10-15 MB/s) transfer speed when copying files from iPAD to external media - occurrs for SSDs, HDDs, SD cards, thumb drives, regardless of connection method, file size, file system (exFAT, APFS, OSX extended journaled). Same setups for all Macbook pros I have at hand exhibit transfer speeds reaching max specs for the devices. (all above 100 MB/s) - I can provide more details in subsequent posts.
  3. Frequent errors when copying large folders and files (5 GB and heavier) - files not visible after copy process or drive disconnects during transfer (probably related to exFAT or power hungry devices)
  4. Transfer progress bar inaccurate (finishes at half-revolution around the circle)
  5. Transfer progress bar visible only after changing view mode
  6. Multiple instances of a copied file listed during copy process (might be expected as one could be a partial file, but looks confusing)
  7. Initiating copy - paste from long press menu (as opposed to drag and drop) operation often does not provide visual feedback of the operation taking place - file name and progress bar visible only after view change.
  8. drag and drop copy-pase often drops the file in the last folder within the active directory, and not the active directory itself - minor annoyance for casual use, but for work related issues this can be a major workflow disrupting problem.


General related issues:

  1. For iPad Pro 11 2018 - Plugging in drives rated at 1,4A @ 5V (example: samsung 850 ssd in external usb-c enclosure) causes system crash during file transfer, without the "usb device requires too much power" message - iPad turns off and then restarts by itself. Does anyone know the recommended Watt/Amp rating for iPad Pro 2018 external USB devices?
  2. Inconsistent file transfer speed via usb-c FROM external media to iPad- especially SD cards (connected via Apple USB-C to USB A dongle or directly to usb-c port)


Regarding transfer speed for iPad Pro 2018:

I'd be grateful for a REAL LIFE max expected transfer speed, not the USB 3.1 spec.


Case in point:

Same sandisk extreme pro SD card connected via dedicated sandisk reader and Apple USB-C to USB-A dongle, transferring raw photos of about 30-50MB each. (I've checked batches of 4, 10 and 50 gigs of images)

  • transfer speeds with usb-c equipped MacBook Pros basically max out the card at 160 MB/s
  • transfer speeds with iPad Pros 2018 (checked a few devices) vary from 60 to a bit over 100 MB/s

I observed similar behaviour for other media, such as SSDs, HDDs and thumbdrives






iPad Pro 11-inch Wi-Fi

Posted on Oct 2, 2019 9:33 AM

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58 replies

May 1, 2020 8:35 AM in response to Korsinou

Right now, the only solution to get respectable speeds to external media is using APFS formatted extrernal SSDs.

Mind you - NOT internal ssds in external enclosures (too power hungry -> may crash iPadOS, at least in my case).


you'd get about 100 MB/s for large files. Smaller - that depends... but generally faster than any other type of media.



Dec 21, 2019 11:59 AM in response to przemja

It could be the cable you are using, the one that Apple ships with the ipad pro is usb 2 speeds supposedly mainly for charging. You would need to try one of these https://www.amazon.com/gp/product/B07213D35X/ref=ox_sc_act_title_1?smid=A294P4X9EWVXLJ&psc=1

I just got an ipad pro Gen 3 512 gig and it took 40 minutes to get a 32 gig file off it to a spinning usb 3 hard drive. Going to try buying one and testing it out. Read more info on Mac Rumors about it here. https://forums.macrumors.com/threads/new-ipad-pro-11-usb-c-data-transfer-speeds.2152119/

Apr 4, 2020 2:21 PM in response to przemja

When I first formatted my sandisk extreme pro to APFS, I was getting errors in the middle of writing a file from the iPad Pro so I formatted it again following sandisks web site directions, and did the formatting in Catalina this time as opposed to the first time I used disk utility in High Sierra. No longer getting any errors. APFS was not a new thing with 13.4. as far as speeds are concerned with the iPad Pro. I was hoping for improved speeds with 13.4s release but sadly no change.

Oct 31, 2019 1:00 AM in response to przemja

I figured the same problem. Transferring speed is quite flawed! Also I don‘t know why there isn‘t a „Remaining Time“ indicator as on the MacBook. It doens‘t make sense, that it‘s that much slower...really should be improved with the next update.


Also: The „Files App“ needs improvements: (1) You should be able to check the size of a folder, otherwise it is hard to check the backup. (2) The remaining space on a disk is yet not visible; also very important for backups.


==> make a feature request!

Dec 21, 2019 1:08 PM in response to Kurt Friis

It does seem that the ipad pro ships with a USB 2 cable with a C connector. I am ordering a new cable and will see if there is an improvement like in this video below. Mine came with a piece of crap, cable and slow charger as it was a amazon refurb. But I saved $450 on it. I'm sure speeds will still be slower than they should be but looks like they can be better with the right cable.

https://www.youtube.com/watch?v=qs4rKJB8GWw

Apr 4, 2020 1:57 PM in response to Lance Mcvickar

Well...

they must have changed sth in iPadOS 13.4

now, for APFS i get the following transfer speeds for copying FROM the iPad to the drive.


thumb drive - sandisk 64GB

- 30 MB/s - (but capable of 100+ MB/s reads and writes on MacBook Pro)


External seagate HDD - 4 TB, freshly formatted to APFS - out of severel tests:

  • about 45 MB/s for 500MB file
  • about 72 MB/s for 4GB video file
  • I also got two write errors while attempting to copy... the drive never once failed before (was in a home nas for a while)

transfers from a macbook pro for the same drive

  • 105 MB/s for the smaller 500MB file
  • 120 MB/s for the 4 GB vide file


Well... that is better than 10MB/s ... but only half as good as MacBooks, and any other USB3 laptop... not to mention you're limited to APFS.



Jun 23, 2020 1:30 AM in response to przemja

Gentle person,


sadly the situation has not improved till today - iPad OS 13.5, iPad Pro 11“ 2020 here. Transfer speeds from the iPad to external drives (of whatever type/connected directly or via powered hub/independent of the file system used on the external drive) are really slow.


Besides being slow on general compared to even old MacBooks with only USB 2, the transfer speed additional breakdown to be related to the number of files, the total size and wether directories are included. E.g. as Long as I copy just a few files (< 50, less than 1Gb, just files, no directory) transfer times are bearable, slow, but bearable.


unacceptable is that when copying e.g. photos, depending of the filesystem of the target disk, more or less files are damaged on the target drive (roughly between 0.x and 1.x percent).


Gentle readers, please file a performance and/or bug report via


https://www.apple.com/feedback/ipad.html


Thanks for your efforts!

Oct 23, 2019 7:33 AM in response to przemja

I have similar problems with similar results, I use my iPad Pro 10.5 512GB (via Apples USB-3 dongles - SD or Camera)


Before iPad OS the notion, that an iPad (Pro or not) could replace a notebook was a farce, but with the current write speeds, it is still a joke.


I have decided, when I have to save weight during flights (I'm not flying first class, nor corporate jets, like "Tim Apple" probably can), I leave my iPad at home and only carry my MacBook Pro 13, 2018 (4 ports) and lot's of external media for a couple of generations of backups of my texts, audio, images and videos produced during travel.


No Apple iPad can even compete with my really old Surface Pro 4, when it comes to backups to external disks. The Windows 10 tablets has other limitations, but speed was never been one of them. When my iPad Pro 10.5 has gone to the eternal bit fields, that will be it, unless Apple really ups the ante significantly.


If carry-on weight allowance is sufficient, the iPad gets included to be used as a second "Sidecar" monitor during video editing via an Apple USB-C to Lightning cable. It helps... and from the MacBook I can create backups on the iPad too, when I'm in a tight spot (double or more speed, than from iPad Pro to an otherwise really fast SSD (but it's a steep price to pay for a few hundred megabytes of slow, spare storage).


Apple really needs to get their act together in my view!


Regards

Dec 22, 2019 9:42 PM in response to Lance Mcvickar

So I am sorry for my earlier posts... I spoke prematurely after being in shock at how long it took to get 32 gigs off the ipad pro to a hard drive the first time I tried it and needed to figure out what was going on and read more before I opened my mouth here. After a few tests today, writing to the ipad took about 6 seconds per gig using the Apple usb c to usb 3 adapter connected to my powered usb 3 hub and a Samsung Evo SSD, but transfering the same file off the ipad took about 30 seconds or more per gig. I hope they fix this soon.

Apr 4, 2020 11:55 AM in response to ruiabreu

To get the best speeds when transfecting files off the iPad pro to external storage,

Format the drive in AFPS not Mac OS journaled or FAT32 . You should see around 120MBps when the drive is formatted in APFS. https://www.youtube.com/watch?v=x2yeqiHAsYM

Apple trickery? The speed is still way slow from what it should be but its much better than any other format.

Apr 4, 2020 3:21 PM in response to Kurt Friis

The files app is flawed for sure along with transfer speeds. Too me its all in the software. Apple is doing this intentionally for some weird reason, a lot of users will return their ipad pros because of it. Maybe next years ipad pro will be thunderbolt 3 as a selling point "Now with fast transfer speeds!"... Odlly very few people complain about it on the web and most big youtubers don't talk about transfer rates for some reason like 9 to 5 Mac. I'm guessing the new iPad Pro 2020 has the same issues but have not seen anyone test the transfer speeds yet.


In the end I love the iPad Pro for what I use it for. I can record 48 tracks of audio to it, and get the files off it to my Sandisk Pro pretty quickly now that I am formatted in APFS. I can run eight stereo synths and output them all seperately to my digital mixer. The audio apps have come a long way and the iPad is very powerful as far as CPU processing and GPU goes.

Apple should really fix this issue and then I would have no complaints.


Apr 4, 2020 4:33 PM in response to ruiabreu

RE ruiabreu's problem


could be anything, really, from the cable (could be USB-C but internally specced at USB2 speeds, like the cable Apple includes for charging), could be that iPadOS does not like exFAT - and it is my guess that the card is formatted to exFAT... Could also be the card reader, or the file itself (maybe it's high frame rate or high bitrate or sth) I've also experienced USB-3 UHS-II readers reverting to USB2 speeds when connectind to iPad, and for no apparent reason - it's also so random I could not even reproduce this particular problem - and unlike the APFS bug (?) for drives formatted in HighSierra, as reported by Lance, and apparently, for Mojave as well, as in my case....

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slow usb-c transfer speeds, reliability and Files app bugs, iPad OS, iPad Pro 2018

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