At TECHBUY, both iPhone 17 Pro and Pro Max currently list 256GB, 512GB and 1TB options. Internal capacity is only one part of filming. Are you shooting HEVC clips for quick sharing or ProRes for a colour-grading workflow? Do you offload footage each evening or keep projects on the phone for weeks? Answer those questions before paying for extra capacity—or assuming that any external drive will record every mode.
1. Start with the format you will actually use
For family clips, short product videos or social posts, the default HEVC or H.264 format is often a sensible start. ProRes is useful for flexible post-production; switching it on does not automatically make every video better. Apple Support notes that a ProRes file can be up to 30 times larger than an HEVC file. Actual size varies by resolution, frame rate, length and scene.
Track a real week: minutes filmed each day, how many takes you keep and how often you offload originals. Do not treat a generic “GB per minute” claim as a rule for every format. Your own capture and editing habits determine the capacity you need.
2. Match 256GB, 512GB or 1TB to your workflow
256GB can suit ordinary clips that you review and offload regularly. 512GB provides more room for several days of footage alongside photos, apps and active projects. 1TB makes sense if you regularly carry a large library or travel without convenient offloading. These are decision patterns, not promises of a fixed number of recording hours.
TECHBUY currently lists these three capacities for both phones. Apple also lists a 2TB Pro Max globally, but TECHBUY does not list that option at editorial time. Leave room for iOS, apps and exports rather than planning to fill every advertised gigabyte.
3. An external drive needs the right cable and write speed
Apple lists USB 3 data transfer up to 10Gb/s through the Pro-series USB-C port with a suitable USB 3 cable. USB-C connectors that look alike do not guarantee the same speed. For large transfers or direct SSD recording, verify the cable, drive, format and power requirements. Do not assume the in-box charging cable provides 10Gb/s data transfer.
Apple’s ProRes guide specifies a minimum 220MB/s write speed for external 4K60 and 440MB/s for 4K120, with no more than 4.5W power draw. Sustained write performance matters more than the prominent maximum read speed on a box. Check compatibility with the exact recording mode you intend to use.
4. Do you actually need ProRes 4K120?
Apple lists ProRes up to 4K120 with external recording on iPhone 17 Pro models. It is a specialist post-production option requiring compatible external storage and substantial space, not a prerequisite for ordinary 4K video. For quick social clips, test an HEVC workflow before buying a drive and extra equipment.
Shoot a few samples in your intended mode, inspect the exports, time the transfer and see how your computer edits them. That reveals whether your bottleneck is phone capacity, drive speed or editing time instead of buying 1TB for a feature you rarely use.
5. Verify transferred files and maintain a separate backup
After filming, copy footage to your computer or chosen storage, play a few clips from beginning and end and verify the files before deleting phone originals. An external drive can disconnect or develop errors; another copy on that same drive is not an independent backup. Keep important work in another location too.
If you use cloud storage, confirm that the upload has finished and the original quality you need is available. A thumbnail appearing on a second device does not prove that the full-resolution file is safely stored. This habit may matter more than moving up one capacity tier.
6. Choose the phone after defining the workflow
If you film often but offload regularly, you can choose the phone that fits your hand and buy enough internal room for current projects. If you film and edit on the phone through long days, Pro Max offers more screen space and higher Apple-rated battery life. Our Pro versus Pro Max guide covers that decision.
Before ordering, check the exact iPhone 17 Pro or Pro Max variant for current price and availability. This article does not recommend an unverified SSD as a compulsory accessory; TECHBUY has not linked a specific drive to this guide.
Conclusion
Buy storage for your format and offloading rhythm, not a supposed universal number of recording hours. 256GB can support a lean workflow; 512GB and 1TB offer more room for retained footage. For ProRes 4K120, plan the USB-C drive, cable and backups as well. Sources: Apple Support Vietnam’s iPhone 17 Pro/Pro Max specifications and “About Apple ProRes on iPhone.”
