Here it is: a 256GB SDXC card holds about 320 minutes of 100Mbps 4K footage. For the spec choice carries through to long-term ownership and resale. Inside: V-rating notes, capacity maths, and offload tips.
A 256GB SDXC card holds roughly 340 minutes of 4K video at 100Mbps, around 8,500 RAW photos at 30MB per file from a 24-megapixel body, or a mixed day of stills and video that most photographers will not fill before a natural offload point.
The footage minutes a 256GB card holds depends entirely on your codec and bitrate. At 4K/30fps using H.264 at 100Mbps, you use roughly 750MB per minute, giving around 341 minutes. H.265 at the same resolution reduces file size by about 40%, stretching 256GB to approximately 570 minutes. At 4K/60fps and 200Mbps, capacity drops to roughly 170 minutes. High-bitrate All-Intra recording at 400Mbps exhausts 256GB in about 85 minutes. A Sony ZV-E10 shooting 4K/30fps in standard mode gives almost 6 hours on 256GB; a Lumix S5 II shooting 4K All-Intra barely manages 90 minutes. Knowing your camera's actual bitrate is the most important input for capacity planning.
RAW file size varies by sensor resolution. A 12-megapixel RAW from a DJI drone runs 12MB to 18MB. A 24-megapixel RAW from a Sony A7C or Nikon Z6 averages 25MB to 35MB. A 45-megapixel RAW from a Sony A7R V averages 55MB to 80MB. At 30MB per file, 256GB holds approximately 8,500 RAW photos. At 65MB per file, that drops to around 3,900 shots. JPEG files are 5 to 8 times smaller, so JPEG-only shooters can store 40,000 to 60,000 images on 256GB. Mixed RAW-plus-JPEG shooting roughly halves the RAW-only count because each capture writes two files to the card.
Event photographers covering a full wedding day commonly mix 2 hours of 4K video highlights with stills work. At 100Mbps, 2 hours of video uses 90GB. Adding 1,000 RAW shots at 30MB each (30GB) and 500 JPEGs at 8MB each (4GB) totals around 124GB. A 256GB card holds this with 132GB remaining, making it sufficient for most South African ceremonies without a card swap.
Most camera bodies show remaining shot count and recording time when a card is inserted. Before every shoot departure, confirm at least 80% free space or format in-camera before you leave. Discovering a half-full card on arrival at a venue wastes setup time and adds stress before the shoot even begins.
No. Card manufacturers measure in decimal gigabytes; operating systems and cameras measure in binary. A card labelled 256GB typically shows as around 238GB available after formatting. This is normal and not a defect.
The number of clips is irrelevant to total storage; only total minutes of footage at a given bitrate determines capacity. Whether you record 340 one-minute clips or one continuous clip, the total data on the card at 100Mbps is the same.
Not really. Beginners tend to shoot large volumes of trial footage and rarely offload regularly. Starting with sufficient capacity prevents the card filling mid-shoot during the learning phase, which is a common frustration avoided with a small budget increase.
Ready to pick the right 256GB card? Browse Evetech's current selection of 256GB SDXC cards across V30 and V60 speed ratings, stocked locally for delivery anywhere in South Africa.
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