How long should it take to copy a 1GB video from PC to Sandisk 64GB MicroSDXC card inside Note 2?

[Kiersten_Kress]

How long should it take to copy a 1GB video from PC to
Sandisk 64GB Class 10 MicroSDXC card inside Note 2?
The PC is connected to the Note 2 via the original USB
cable supplied by Samsung. The video is a 1GB 720k MKV.

Is it normal that it takes almost 5 minutes for this one file?

 

[Farish]

How long should it take to copy a 1GB video from PC to
Sandisk 64GB Class 10 MicroSDXC card inside Note 2?
The PC is connected to the Note 2 via the original USB
cable supplied by Samsung. The video is a 1GB 720k MKV.

Is it normal that it takes almost 5 minutes for this one file?

Yes.

Write Speeds average around 10 mb/s. You won't get close to maximun listed speeds because no phones currently uses UHS-I. Only devices that support that are Cameras.

 

[cdf3]

You will get a much better transfer speed by taking the Micro SDcard out of your Note II, and placing it into a standard SDcard adapter. Place the adapter, with the micro SDcard inside of it, into your PC card reader slot.
I transferred nearly 10 GB of files and folders to my PC in less than 5 minutes using this method.
It takes a little longer writing the files back to the card. Took about 15 minutes to transfer nearly 10 GB.

Sent from my SCH-I605 using Tapatalk 2

 

[Farish]

You will get a much better transfer speed by taking the Micro SDcard out of your Note II, and placing it into a standard SDcard adapter. Place the adapter, with the micro SDcard inside of it, into your PC card reader slot.
I transferred nearly 10 GB of files and folders to my PC in less than 5 minutes using this method.
It takes a little longer writing the files back to the card. Took about 15 minutes to transfer nearly 10 GB.

Sent from my SCH-I605 using Tapatalk 2

Read speeds are about 2.5 faster than write speeds. He was talking about copying from his pc to his SD card.

 

[cdf3]

Read speeds are about 2.5 faster than write speeds. He was talking about copying from his pc to his SD card.

I mentioned that in the last sentence.

Sent from my Nexus 7 using Tapatalk 2

 

[Farish]

I mentioned that in the last sentence.

Sent from my Nexus 7 using Tapatalk 2

My point is there would be no difference in speed whether through an outside adapter or with his phone connected.

You wrote:

You will get a much better transfer speed by taking the Micro SDcard out of your Note II, and placing it into a standard SDcard adapter. Place the adapter, with the micro SDcard inside of it, into your PC card reader slot.

You would get the same speed benefits either way also as the limitation has to do with the card itself.

With what you suggested his speed to write to his card would still be limited at 10mbs.

The read speeds still will cap out around 25mbs.

Hooking up to your phone vs a sd card adapter will make zero difference.

 

[Trees]

Sharing the following for consideration.

Depending upon MicroSD Card Type, Read and Write speeds can vary due to a variety of factors including, but not limited to (shown in no particular order):

1. Card Specifications (maximum theoretical and practical bandwidth, latency, etc.)
2. File Size (how large is the file(s) being transferred)
3. IO Profile (block size, read/write ratio)
4. Phone bus bandwidth (how wide is the pipe that supports the USB port to phone bus (data path and supporting electronics/software) to SD card)
5. Computer to MicroSD Card connectivity (USB 1.0, 2.0, 3.0, WiFi, FTP, SMB, etc.)
5. Other (work that the MicrosSD Card, phone and computer are doing while the transfer is underway)

SanDisk Ultra microSDHC and microSDXCUHS-I Memory Card by SanDisk shows that this particular card supports transfer speeds up to 30 MB/sec. Assuming thats the maximum theoretical rate for a 100% read small block sequential IO profile, then its probably a speed thats been achieved in lab like conditions and specific benchmarking tools.

https://en.wikipedia.org/wiki/Universal_Serial_Bus#USB_2.0_.28High_Speed.29 shows that microUSB v2.0 (MHL), the USB port and bus type that the Note 2 appears to have; supports up to 35 MB/sec maximum theoretical.

With the two specifications and the various factors above in mind, the most that could be transferred to the MicroSD Card in a USB connected use case is 30 MB/sec. If the other factors are at play, and the IO Profile is large block and random in nature (reads and writes), then the transfer rate will be less than the maximum theoretical that the MicroSD Card can support.

 

[Trees]

While grilling out in the backyard last night I remembered that I needed to copy over a bunch of Nandroid backups to my home NAS as my Sandisk 64GB MicroSDXC card was getting full. So, using Root Explorer, I fired off the copy job shown in the screenshot.

Keeping the factors noted in the post above in mind; the WiFi connection was ~ 26 Mbps, or Megabits per second. That's approximately 9 MB Megabytes per second. So, for a total file copy size of 15.6GB, Root Explorer estimated a total transfer time of ~ 2 hrs and 36 minutes, or 156 minutes. The SMB share lives on a RAID 1 volume, so factor that in as another variable, as was the other stuff flying around the home WiFi network.

Given it was still warm when grilling, I didn't stay outside the entire time. After coming back inside the WiFi connection rate jumped up to as high as 76 Mbps (near the access point), and then fluctuated back down to mid 30s in a room farther from the access point. Again, these are factors to consider when trying to measure transfer rates between point A to B.

 

[kgk1985]

While grilling out in the backyard last night I remembered that I needed to copy over a bunch of Nandroid backups to my home NAS as my Sandisk 64GB MicroSDXC card was getting full. So, using Root Explorer, I fired off the copy job shown in the screenshot.

Keeping the factors noted in the post above in mind; the WiFi connection was ~ 26 Mbps, or Megabits per second. That's approximately 9 MB Megabytes per second. So, for a total file copy size of 15.6GB, Root Explorer estimated a total transfer time of ~ 2 hrs and 36 minutes, or 156 minutes. The SMB share lives on a RAID 1 volume, so factor that in as another variable, as was the other stuff flying around the home WiFi network.

Given it was still warm when grilling, I didn't stay outside the entire time. After coming back inside the WiFi connection rate jumped up to as high as 76 Mbps (near the access point), and then fluctuated back down to mid 30s in a room farther from the access point. Again, these are factors to consider when trying to measure transfer rates between point A to B.

There's 8bits in a byte. 26Mbps=3.25MBps

sent from Galaxy Note 2

 

[Trees]

There's 8bits in a byte. 26Mbps=3.25MBps

sent from Galaxy Note 2

Good catch. You're correct. Replaying this back I recall that the beverage monster was starting to appear. I confused myself and transposed 76 instead of 26, which is approximately 9.

 

[kgk1985]

Good catch. You're correct. Replaying this back I recall that the beverage monster was starting to appear. I confused myself and transposed 76 instead of 26, which is approximately 9.

Damn beer monsters. That sneak up on you at the most unexpected times

sent from Galaxy Note 2