Most (all?) SSDs code the data before writing it so you don't commonly get runs of 0s or 1s. Quite a few also at least claim to encrypt it securely, so you can

Most (all?) SSDs code the data before writing it so you don't commonly get runs of 0s or 1s. Quite a few also at least claim to encrypt it securely, so you can erase the whole thing by just changing the encryption key.