SD card speed

[Max Headroom]

I moved a few videos off the SD card i use in the drone onto the PC so i could make more room on the card and have a backup, i found the transfer speed to be very low it hit 23Mbps (using USB 3) but the card info said it can be up to 150 Mbps has anyone here struggled with this and did you find a solution?


This is the card i am using to transfer to -

The SanDisk Ultra microSDHC card is perfect for storage expansion, not only for Android devices and tablets, but for Windows laptops and Chromebooks as well. It provides a future-proof solution for storing massive media collections--high-res photos, videos, and music, plus podcasts, documents, games, and shows from streaming sites like Netflix.

MicroSDXC memory card.

• 256GB capacity.
• Read speed 120MB per sec.
• Includes microSD adaptor to convert to SD size, for compatible devices.
• Not backwardly compatible with SD only devices.

 

[mavic3usa]

Just get a microSD on the list:

List of Recommended Storage Cards for Drones

List of Recommended Storage Cards for Drones

support.dji.com

 

[MS Coast]

I moved a few videos off the SD card i use in the drone onto the PC so i could make more room on the card and have a backup, i found the transfer speed to be very low it hit 23Mbps (using USB 3) but the card info said it can be up to 150 Mbps has anyone here struggled with this and did you find a solution?

How are you connecting the card to the computer? An internal card reader on the computer or an external card reader and cable? The cable may be the limiting factor. Older, simpler cables just can't handle higher data transfer speeds.

 

[Max Headroom]

How are you connecting the card to the computer? An internal card reader on the computer or an external card reader and cable? The cable may be the limiting factor. Older, simpler cables just can't handle higher data transfer speeds.

I am connecting using a USB3 port.

This is the reader it came with its own cable -

 

[Max Headroom]

Just get a microSD on the list:

The SD card i use in the drone was recommended in the DJI advert when i bought the fly more combo the second should be able to reach speeds of 120 Mbps so i don't se the point in buying more.

 

[Felix le Chat]

The SD card i use in the drone was recommended in the DJI advert when i bought the fly more combo the second should be able to reach speeds of 120 Mbps so i don't se the point in buying more.

It's not the read speed you need to focus on, it's the write speed. A professional digital cinematographer recommends that cards used in 4K capable digital cameras should be able to handle a minimum of 100mbps write speed.

Look for a V90 U3 microSD. Reasons given below.

 

[Max Headroom]

It's not the read speed you need to focus on, it's the write speed.

Thanks.

A bit of digging and it says max 80MB/s for my Ultra i am only getting 23 MB/s

1. Read/Write Speeds​

One key difference between Sandisk Ultra and Extreme is the write speeds. A San Disk Ultra card has a max write speed of 80MB/s, while the SanDisk Extreme cards reach up to 90MB/s. This refers to how fast a photo or video is saved to your memory card.

So, the SanDisk Extreme will have shorter buffering times. The read speed of the SanDisk Extreme is up to 160MB/s. This makes the Sandisk Ultra write speed objectively better.

In this aspect of the SanDisk Ultra vs Extreme Pro, the Sandisk Ultra is the clear winner.

 

[Felix le Chat]

Thanks.

A bit of digging and it says max 80MB/s for my Ultra i am only getting 23 MB/s

1. Read/Write Speeds​

One key difference between Sandisk Ultra and Extreme is the write speeds. A San Disk Ultra card has a max write speed of 80MB/s, while the SanDisk Extreme cards reach up to 90MB/s. This refers to how fast a photo or video is saved to your memory card.

So, the SanDisk Extreme will have shorter buffering times. The read speed of the SanDisk Extreme is up to 160MB/s. This makes the Sandisk Ultra write speed objectively better.

In this aspect of the SanDisk Ultra vs Extreme Pro, the Sandisk Ultra is the clear winner.

"...SanDisk Extreme has a maximum write speed of 90mbps..."

Whereas the Lexar V90 U3 has a minimum guaranteed write speed of 90mbps.

Did a lot of research on this after spotting buffering and dropped frames in 4K clips... Talked to a professional cinematographer... and actually listened to his advice.

 

[SkyeHigh]

Just to clarify are you specifying Megabits per second (Mbs) or Megabytes per second (MBs)?

SD cards are serial devices requiring a serial transfer so one byte of data requires transfer of each bit individually, one-by-one.

The figures quoted in adverts are the maximum sequential Write rates and in real life write and read rates are quite a lot less. Transfer speed is affected by the USB type (1, 2, or 3), the device providing the USB interface (card reader and PC port), the type and performance of the PC, the Operating System, the type of internal USB interface and bus, the cable type (USB 2 or 3) and even the write speed of the disk storage the transferred file is written to. File transfers on a standard Windows PC have always been pretty average and 3rd party file transfer applications are faster.

The SD Standards actually specifies the SD interface only supports a maximum sequential Write speed of 90MBs for the standard SD format (SD Express can reach 600MBs) so the advertised figures should be taken with a pinch of salt.

USB 2 gives a real world read transfer rate of 30-40 Megabytes/second.

USB 3 gives a transfer rate of 5Gbs (10 & 20Gbs options also available) but real world speeds will be limited to the maximum speed of the SD card (90MBs) and remember 90MBs is the real world sequential WRITE speed limit of the card and READS are slower.

Unless the video clip was recorded as a continuous sequential file on a freshly formatted card then the read speed of the file will be even slower as fragmentation does affect file transfer speed.

 

[HoozierDroneDaddy]

No one is talking about the UHS-I, UHS-II, and UHS-III channels. It is important to know if your camera or drone supports UHS-II or III. If not then your camera or drone will not take advantage of the speeds from the UHS-II or III SD cards as your device only has one channel. So even though the card is rated at the higher speeds, it will not help. Look on the back of your card, you will see either one or two rows of contact pins. UHS-I has one row, II and III have two rows of contacts.
U1, U2, U3 on the card after the V30 or V90

 

[Max Headroom]

I have made the edited below to my original question as i didn't realise i had not explained its from PC to SD card -

I moved a few videos off the SD card i use in the drone onto the PC so i could make more room on the card and have a backup, i found the transfer speed from PC to the back up SD card to be very slow it hit 23Mbps (using USB 3) but the card info said it can be up to 150 Mbps has anyone here struggled with this and did you find a solution?

Having read all the great and informative posts in the thread i have decided to be happy with 23Mbps it doesn't take long to download the drone footage to my PC i was just being impatient