{"id":14207,"date":"2025-08-08T16:04:29","date_gmt":"2025-08-08T12:04:29","guid":{"rendered":"https:\/\/droneandcam.com\/post\/sony-a6400-sd-cards-u3-v60-speed-for-4k-video\/"},"modified":"2026-02-19T19:37:09","modified_gmt":"2026-02-19T15:37:09","slug":"sony-a6400-sd-cards-u3-v60-speed-for-4k-video","status":"publish","type":"post","link":"https:\/\/droneandcam.com\/en\/post\/sony-a6400-sd-cards-u3-v60-speed-for-4k-video\/","title":{"rendered":"Sony a6400 SD cards: U3\/V60 speed for 4K video"},"content":{"rendered":"\n

Choosing the<\/a> right SD card<\/a> for your Sony A6400 is sometimes a headache, especially when you want to film in 4K video<\/em> or string together bursts without rowing. In this guide, we break down the UHS-I U3, V30 and the ideal capabilities to keep your memory card up to the pace of your creativity. What if you knew that some models can even double your peace of mind in extreme conditions? <\/p>\n\n

\"Sony
Sony a6400<\/figcaption><\/figure>\n\n

Memory card requirements for the Sony a6400<\/h2>\n\n

The Sony a6400 doesn’t have internal storage. We all know that without a suitable memory card, it is impossible to shoot in 4K or store RAW files. A minimum UHS-I U3 card is required to avoid recording errors. Personally, I tested: a slow card blocks the 4K mode. Clearly, the body depends entirely on the quality of the SD card<\/strong> to exploit its photo and video capabilities. <\/p>\n\n

For 4K video, the write speed should be up to 30MB\/s (U3 standard). Without it, the camera’s buffer fills up quickly and the RAW burst stops. For example, a 64 GB (250 MB\/s) Lexar card reduces the buffer flush time to 2 seconds instead of 15 seconds. As a result, a fast card avoids burst micro-outages and optimizes workflow. In short, the quality of the card determines the fluidity of use<\/strong>. <\/p>\n\n\n\n\n\n\n\n\n\n\n

\n\n\n
\n \"SanDisk\n

SanDisk 512 GB Extreme PRO<\/h3>\n

Rating: 4.8\/5<\/p>\n

\n \u2605 \u2605 \u2605 \u2605 \u2605\n <\/div>\n Buy on Amazon<\/a>\n<\/div>\n\n\n
\n \"Lexar\n

Lexar 512 GB SILVER PRO<\/h3>\n

Rating: 4.6\/5<\/p>\n

\n \u2605 \u2605 \u2605 \u2605 \u2605\n <\/div>\n Buy on Amazon<\/a>\n<\/div>\n\n\n
\n \"Gigastone\n

Gigastone SDXC 256 GB card<\/h3>\n

Rating: 4.7\/5<\/p>\n

\n \u2605 \u2605 \u2605 \u2605 \u2605\n <\/div>\n Buy on Amazon<\/a>\n<\/div>\n\n<\/div>\n\n\n\n\n

Types and specifications of compatible SD cards<\/h2>\n\n

Important standards and speed classes<\/h3>\n\n

UHS-I and UHS-II define the maximum transfer speed, while U3, V30 and V60 classes ensure minimum write. For the Sony a6400, U3 (30 MB\/s) is the minimum for 4K video. Personally, I tested: a V60 card (60 MB\/s) offers more margin for future demanding formats. Clearly, UHS-I is compatible with most devices, but UHS-II remains reserved for the most recent cameras. <\/p>\n\n

Comparison of SD card speed classes for the Sony a6400<\/h3>\n\n
Speed class<\/td>Guaranteed minimum write speed<\/td>Recommended use for the Sony a6400<\/td><\/tr>
UHS-I U1<\/td>10 MB\/s<\/td>Insufficient for 4K video, suitable only for low-resolution JPEG photography<\/td><\/tr>
UHS-I U3<\/td>30 MB\/s<\/td>Minimum required for 4K video at 30fps or moderate burst RAW photo<\/td><\/tr>
V30<\/td>30 MB\/s<\/td>U3 equivalent but with better stability for extended 4K video recording<\/td><\/tr>
V60<\/td>60 MB\/s<\/td>Recommended for 4K video at 60fps or simultaneous RAW + JPEG shooting<\/td><\/tr>
V90<\/td>90 MB\/s<\/td>Optimal for future 4K RAW videos or ultra-long burst sessions<\/td><\/tr><\/tbody><\/table><\/figure>\n\n

The write speed determines how smooth the video recording and the RAW burst are. For 4K, a U3 card (30 MB\/s) is a must, but a V60 (60 MB\/s) reduces buffer times. For example, a 64 GB (250 MB\/s) Lexar card flushes the 1 GB buffer in 2 seconds instead of 15 seconds. As a result, the faster the card, the more you avoid micro-outages in intensive mode. In short, speed directly influences the user experience<\/strong>. <\/p>\n\n

Optimal capacity and performance<\/h3>\n\n

Capacities range from 32GB to 256GB, with choices to suit usage. For photography, 64GB is enough for multiple sessions, while 128GB is ideal for the XAVC S 4K. Personally, I tested: a 64 GB card stores 2400 RAW photos or 105 minutes of 4K video. In other words, the higher the capacity, the more frequent changes you can make<\/strong>. <\/p>\n\n