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:
- 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
- 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.
- 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)
- Transfer progress bar inaccurate (finishes at half-revolution around the circle)
- Transfer progress bar visible only after changing view mode
- Multiple instances of a copied file listed during copy process (might be expected as one could be a partial file, but looks confusing)
- 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.
- 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:
- 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?
- 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