I think that it would be better to use the DVRP's functions to format the disk (it is functions to adjust the disk's capacity). Although you should know that it is far cheaper in the long run to just play your games with a CEX PlayStation 2. The HDD unit of the PSX will not last forever and there is no way to replace it. That warning is for users of APAEXT, which was a custom formatting scheme that the DMS4 ToxicOS used. Historically, the APA driver always used the whole disk for itself. APAEXT, on the other hand, formats up to the first 137GB for use with SONY software (the normal APA scheme). The 48-bit LBA region is hence used for the ToxicOS software.