Simply storing cryptocurrency on a regular flash drive is no longer considered safe due to a number of significant risks associated with the vulnerability of this method in the modern digital environment.
Firstly, regular USB flash drives do not have built-in protection against unauthorized access, which makes them vulnerable to physical loss or theft. If an intruder obtains the device, they will be able to try to access the private keys or seed phrases stored on it, especially if they are written in an open or insufficiently protected form. This can lead to a complete loss of funds.
Secondly, a flash drive as a storage medium is subject to technical failures: damage, failure, or accidental deletion of data can also lead to loss of access to cryptocurrency. Unlike hardware crypto wallets, which are protected by hardware encryption and PIN codes, a simple flash drive does not provide such protection.
Thirdly, using a flash drive requires very careful handling of files and passwords, as well as knowledge of secure encryption and backup. Many notorious cases of people losing access to huge amounts of cryptocurrency due to losing a flash drive or a forgotten password confirm the lack of reliability and convenience of this method.
Finally, the flash drive is not protected from malware. When connected to an infected computer, keys can be stolen through malware or phishing attacks.
Modern hardware wallets (e.g., Ledger, Trezor) solve many of these problems: they store keys in a chip protected from tampering, require confirmation of transactions on the device itself, and also use PIN codes and protection against physical hacking. In addition, a popular practice is not to store keys on regular flash drives at all, but to write seed phrases on physical media (paper, metal plates), which significantly reduces the risk of compromise.
Thus, despite the fact that flash drives were previously one of the popular ways to store cryptocurrency, today a simple USB drive without specialized protection is considered unsafe due to the risk of loss, theft, lack of encryption, and vulnerability to technical failures and malicious attacks.
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