Int64 File Seeking ???

Newsgroups	comp.os.linux.misc
From	"25B.E866" <25B.E866@noaaba.net>
Subject	Int64 File Seeking ???
Organization	protonic seahorse
Date	2023-02-22 01:52 -0500
Message-ID	<Uh2cnczb7I4tJmj-nZ2dnZfqnPWdnZ2d@earthlink.com> (permalink)

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I arrived at a need to search hard drives - like
up to 16 terabyte hard drives - AND kinda show what's
going on. THE problem is that if you need to look at
a SPECIFIC spot on the disk the usual "seek()"
functions crap out - limited to longint (about 2.4
gig). Free Pascal CLAIMS its fseek() will take an
int64 ... but in practice I see the exact same bits
of the disk come up again, which means it's rolling
over. Just started experimenting with Python - I'll
know in a day or two.

The GCC lib - sometimes requiring special flags -
claims it'll do 64-bit seeks - but I haven't
confirmed that yet either.

Consider 'dd' ... you can copy all, or parts of,
huge disks. Tell it to start at the 3tb mark
and it'll do it. I'm not sure if that uses any
of the standard 'C' libraries or is something
totally custom under the hood. It IS kinda
slow alas - try duplicating, or even zeroing, a
12tb disk sometime ... better start on friday
afternoon ......

A lot of languages/compilers were refined when
the old 2 gb files were kind of the max. You
CAN view a big disk AS a file if need be. The
world moved on, but it seems THEY didn't.

Any insights ???

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Thread

Int64 File Seeking ??? "25B.E866" <25B.E866@noaaba.net> - 2023-02-22 01:52 -0500
  Re: Int64 File Seeking ??? Richard Kettlewell <invalid@invalid.invalid> - 2023-02-22 08:55 +0000
    Re: Int64 File Seeking ??? The Natural Philosopher <tnp@invalid.invalid> - 2023-02-22 13:38 +0000
      Re: Int64 File Seeking ??? Richard Kettlewell <invalid@invalid.invalid> - 2023-02-22 14:11 +0000
        Re: Int64 File Seeking ??? "25B.E866" <25B.E866@noaaba.net> - 2023-02-22 20:38 -0500
      Re: Int64 File Seeking ??? "25B.E866" <25B.E866@noaaba.net> - 2023-02-22 23:53 -0500
        Re: Int64 File Seeking ??? Robert Riches <spamtrap42@jacob21819.net> - 2023-02-23 05:11 +0000
          Re: Int64 File Seeking ??? Bobbie Sellers <bliss@mouse-potato.com> - 2023-02-22 21:29 -0800
          Re: Int64 File Seeking ??? "25B.E866" <25B.E866@noaaba.net> - 2023-02-23 00:49 -0500
            Re: Int64 File Seeking ??? The Natural Philosopher <tnp@invalid.invalid> - 2023-02-24 13:13 +0000
              Re: Int64 File Seeking ??? Richard Kettlewell <invalid@invalid.invalid> - 2023-02-24 14:58 +0000
              Re: Int64 File Seeking ??? Pancho <Pancho.Jones@proton.me> - 2023-02-24 15:13 +0000
                Re: Int64 File Seeking ??? "25A.I866" <25A.I866@noacba.net> - 2023-02-26 00:05 -0500
              Re: Int64 File Seeking ??? "25A.I866" <25A.I866@noacba.net> - 2023-02-25 23:58 -0500
    Re: Int64 File Seeking ??? "25B.E866" <25B.E866@noaaba.net> - 2023-02-22 10:14 -0500
      Re: Int64 File Seeking ??? Bobbie Sellers <bliss@mouse-potato.com> - 2023-02-22 08:52 -0800
        Re: Int64 File Seeking ??? The Natural Philosopher <tnp@invalid.invalid> - 2023-02-22 16:55 +0000
        Re: Int64 File Seeking ??? Bobbie Sellers <bliss@mouse-potato.com> - 2023-02-22 12:36 -0800
  Re: Int64 File Seeking ??? "Carlos E.R." <robin_listas@es.invalid> - 2023-02-24 20:50 +0100

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