The error is intimidating but usually fixable. In 80% of cases, using DiskPart's clean command from a Windows PC resolves the issue in under five minutes. For the remaining 20%, the card is either counterfeit or physically damaged.
: SD2Vita adapters are inexpensive and frequently have a high failure rate out of the box. format failed c127559 full
: Use a PC to format the card to exFAT with "Default Allocation Size" before putting it back in the Vita. The error is intimidating but usually fixable