I am not too technical into all this ,but if 4 GB is the limit ,then I should have no problem..... -----Opprinnelig melding----- Fra: TMG [mailto:[email protected]] På vegne av Dennis Lee Bieber Sendt: 22. november 2017 14:50 Til: The Master Genealogist Rootsweb Email List <[email protected]> Kopi: TMG-L submission address <[email protected]> Emne: Re: [TMG] 2Gb file limit At 07:48 PM 11/21/2017, Michael J Hannah wrote: >Dennis Lee Bieber replied: >>VFP can only address bytes 0 to 2147483647. >>At best, it will refuse to save any record that would require >>exceeding the 2GB boundary. >>At worst, it wraps around and corrupts data ... a negative offset > >Actually, as a retired computer geek who was involved in the Y2K >issues, wrap around can be even worse. Rather than a negative offset >it is more likely to truncate, overwriting your oldest data. >2147483647+1 => 0 2147483647+2 => 1 ... Y2K wrap around was due to the use of an implied century with a 2-digit /decimal/ year. The 2GB limit is due to use of a /signed/ binary 32-bit integer rather than an /unsigned/ binary 32-bit integer (which would give a 4GB limit). The positive range of the integer uses 31-bits, it becomes negative when it overflows into the 32nd bit. {It's also a problem with anything written in Java -- which does not have an unsigned data type; and I don't know if it supports 64-bit integers either.} -- [email protected] Dennis Lee Bieber HTTP://home.earthlink.net/~bieber.genealogy/ The TMG archive is found here: http://archiver.rootsweb.ancestry.com/th/index/TMG/ Instructions on how to subscribe to TMG: http://lists.rootsweb.ancestry.com/index/other/Software/TMG.html ------------------------------- To unsubscribe from the list, please send an email to [email protected] with the word 'unsubscribe' without the quotes in the subject and the body of the message