SanDisk launches the Optimus GX C50 expansion card for Xbox Series X and Series S, challenging existing options with competitive pricing amidst rising demand and limited stock, promising to boost console storage ahead of major game releases like GTA VI.
SanDisk has entered the Xbox storage race with the Optimus GX C50, a licensed expansion card for Xbox Series X and Series S that makes SanDisk the third approved maker for Microsoft’s proprietary slot. The cards come in 512GB, 1TB and 2TB versions, and early retail listings suggest they will reach stores in late August 2026. The launch arrives at a difficult moment for console owners, with Xbox hardware prices having risen earlier this month and major new releases, including Grand Theft Auto VI, pushing demand for additional storage.
The new card uses the same basic expansion format as earlier Xbox products from Seagate and Western Digital, which means performance should match Microsoft’s storage requirements rather than vary by brand. Xbox’s expansion system is designed to preserve the console’s fast-loading behaviour and Quick Resume support, so buyers are not choosing between different speeds so much as different prices, capacities and warranties. GamesRadar reported that SanDisk is positioning the line as a lower-cost alternative to existing licensed options.
Pricing is the most striking part of the launch. SanDisk lists the 1TB Optimus GX C50 at $199.99, with 512GB at $109.99 and 2TB at $339.99. Those figures undercut the WD_BLACK C50 sharply: GamesRadar noted that WD’s 1TB card is currently listed at $374.99. SanDisk’s own site also shows higher standard prices crossed out above the launch offers, which strongly suggests these are introductory discounts rather than permanent retail levels.
Retail pricing is already more uneven. Windows Central reported on August 7 that Seagate expansion cards were becoming scarce and, in many cases, had climbed above $300 at some stores, though some retailers were still offering lower prices. Against that backdrop, SanDisk’s direct-to-consumer pricing looks especially aggressive, but third-party listings are already higher, including a Best Buy price that sits well above SanDisk’s own site. That gap matters for anyone trying to avoid paying after the launch window closes.
There is also a corporate wrinkle. SanDisk was previously part of Western Digital, and the flash business became a separate public company in February 2025. That means the Optimus GX C50 is new in name, but not in engineering lineage. The card is effectively the successor to the WD_BLACK C50, now sold under SanDisk’s Optimus branding, which the company introduced as part of a broader product reorganisation at CES 2026.
For Xbox owners, the launch matters because storage pressure keeps rising while the console’s upgrade path stays closed. Microsoft’s official Seagate expansion cards remain the reference point, with 1TB, 2TB and 4TB options sold through Xbox’s accessory store. SanDisk’s entry does not change the architecture, but it does increase competition in a market that has been tight for years. If the introductory prices hold, the Optimus GX C50 could become the most practical licensed option for players who need more room before the next wave of large games arrives.
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