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DVHS on a Budget

Kerhop writes "ecoustics.com has an article on how to convert SVHS tapes to work in DVHS recorders which is similar to modifying a floppy drive (like we did years ago) to double the storage. There's two holes on a DVHS cassette and a single hole on the SVHS tape. The hole common to both permits DVHS tapes to handle SVHS signals; the hole unique to DVHS is what we want to focus on. Just cut off the top four to five millimeters of the pin within the recorder itself."

18 of 184 comments (clear)

  1. Mod affects future products? by fembots · · Score: 3, Insightful

    After reading several mods which are simply a case of bypassing feature restrictions, I wonder if these mods will force manufacturers to forgo the quick-and-dirty upgrade (i.e. same model with features disabled/enabled) and go for the more expensive redesign route?

    So the question is, will you be forced to upgrade if you can't mod your current hardware?

    1. Re:Mod affects future products? by Murphy+Murph · · Score: 4, Insightful
      After reading several mods which are simply a case of bypassing feature restrictions, I wonder if these mods will force manufacturers to forgo the quick-and-dirty upgrade (i.e. same model with features disabled/enabled) and go for the more expensive redesign route?


      As long as the marketplace is as price-sensitive as it is currently, I think there is no reason to fear that manufacturers will do anything that will raise the price of their hardware.
      --
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  2. Perhaps there is a reason... by busonerd · · Score: 5, Insightful

    One might assume that there is a reason for these holes.. Perhaps SVHS media is not as high quality as DVHS?

    1. Re:Perhaps there is a reason... by MerlinTheWizard · · Score: 2, Insightful

      Well, maybe so. Actually, I bet so. Just like the story of floppy disks (single sided vs. double sided vs. high density), the actual industrial process might be exactly identical, but the testing phase will allow different grades of quality.

      I've read some people suggest that SVHS and DVHS might be exactly the same media, just sold as different to make potentially more money. Well, that would be actually counter-productive; products need to pass some tests before being ready to get sold. That wouldn't make any industrial sense to validate all the products for the highest grade, throw away the rest and sell those who passed as different products. So when you buy the cheaper product, you can almost rest assured that it is of lowest quality. And just because it seems to "work" doesn't mean that it's reliable. What you know is that there are great chances that they haven't been tested for the use you're trying to put them to.

      Unless factories can afford to throw away a lot of material, there is absolutely no incentive to sell identical quality products as differents grades. I just don't see how that could be.

      Finally, some people would raise the question of "overclocking", which has become pretty "mainstream" amongst PC users. When you overclock, you know you're playing with the safety margins that have been validated in the factory. It's your choice, but it's pushing your luck...

    2. Re:Perhaps there is a reason... by MerlinTheWizard · · Score: 2, Insightful

      I did talk about the usual case, where indeed the manufacturing process is the exact same (so, no extra cost here), but the final products are graded through some kind of final testing before shipping. The testing can be the exact same too and just lead different results as to classify the end product. This is very often how the industrial process works. In that scenario, there is no extra cost; the different grades are just determined at the end of the fabrication process. Of course, there is also a batch of items that are even unusable and are thrown away, and/or recycled.

      This is how it works for fabricating chips, for instance, and how it used to work for the fabrication of floppy disks (which were low-level formatted at the factory and graded according to their ability to retain some specific density requirements). For chips, they are tested thoroughly and graded according to the results of the tests. If you thought chips were just manufactured and shipped, you're really wrong. I'm willing to guess the exact same process applies to magnetic/optical media, because there is always a certain amount of failure during fabrication and a factory must ensure every product that goes out will work - or at least keep the failure ratio extremely low. For instance, how many CD-Rs that you bought have failed you and you know for sure it was because of the medium? Very, very few, I'm guessing. How many CD-Rs do you think a factory throws away after fabricating them and they don't pass testing? Probably much more than you think.

  3. wrong for so many reasons by frovingslosh · · Score: 4, Insightful
    Just cut off the top four to five millimeters of the pin within the recorder itself.

    This makes lots of sense, just cut of a metal pin (in a video recorder that will not react well to any stray metal filings) rather than bypass the switch that the pin connects to.

    --
    I'm an American. I love this country and the freedoms that we used to have.
  4. This is dumb... by dirkin · · Score: 4, Insightful

    There is a reason for the two holes.. it's to tell the deck that there is a quality tape in there...

    When your crappy svhs tapes don't work and have dropouts when recording in DVHS mode... don't complain to the company.. you bought sh*tty tape!

    it was the same with floppies... I never trusted any floppy that some moron punched a hole in.

    This is not feature restriction, the manufacturer is not trying to screw you... They put an extra hole in the tape to tell the player that this tape will actually work with the deck properly!

    Cheers,
    -ben

    --
    Some people are only alive because it's illegal to kill them.
  5. And in other news... by geekboy642 · · Score: 4, Insightful

    A hacker in New York uploads new firmware to his 40GB harddrive, and all of the sudden, it's a 400GB!

    The quality of the media is what limits the tape, not a pin. A pin just tells the recorder what quality the media is, so it doesn't try to write more complicated data than the medium can store.

    --
    Just another "DOJ fascist authoritarian totalitarian bootlicker" -- Zeio
  6. Who has a DVHS? by voidstin · · Score: 5, Insightful

    This is a great hack for all 17 people who have a DVHS recorder, have the time to do the hack, the willingness to modify their expensive gear, the money to replace it once it breaks, AND are too cheap to buy the recommended tape stock.

  7. Old Floppy Disks by jpiggot · · Score: 2, Insightful
    This reminds me of the old days of 3.5" floppy disks, when you'd cut a notch to make it double sided. Everyone would laugh and joke at how they'd stick it to the man, and then save their "Wizardry" games or word processing documents on disks that would eventually crap out on them.

    1. Re:Old Floppy Disks by ViXX0r · · Score: 2, Insightful

      All floppy disks eventually crap out, regardless of modifications. It was and is a poor medium in which to assume any amount of storage stability exists.

      --
      University - a box of academia nuts.
  8. This is not dumb... by TWX · · Score: 4, Insightful
    When your crappy svhs tapes don't work and have dropouts when recording in DVHS mode... don't complain to the company.. you bought sh*tty tape!

    it was the same with floppies... I never trusted any floppy that some moron punched a hole in.

    This is not feature restriction, the manufacturer is not trying to screw you... They put an extra hole in the tape to tell the player that this tape will actually work with the deck properly!
    Do you actually know the differences between SVHS and DVHS tape media? Do you know anything about SVHS tape at all even?

    I pose these questions because people are increasingly finding that for marketing purposes companies are rebranding and ever-so-slightly modifying things, like casings in this instance, so that they can create different price points while using materials with no particular difference.

    Smart people in this community have found out that they can change how their DVD drives work by reflashing the firmware, and some have figured out how to make their low-line burner drives work as the high-end product by similar means. I wouldn't be surprised if someone reflashed the firmware on a hard disk drive, low-level-formatted it, and found that the part was otherwise identical to the model with a quarter more capacity.

    There is every reason to assume that "tape is tape" in this instance would apply, and that for the sake of manufacturing ease they've gone to using the same media for both SVHS and DVHS, simply using a different package for the newer, "better" standard.
    --
    Do not look into laser with remaining eye.
    1. Re:This is not dumb... by Nogami_Saeko · · Score: 2, Insightful

      It's an interesting theory, but it may very well be wrong...

      SVHS tapes have a higher coercitivity than regular tape, which means that it takes a stronger magnetic signal to write the information to the tape. It also means that on tapes with a low coercitivity, the signal can be too strong and will not record properly.

      This was the case for drilled or modified VHS tapes. Sure, they'd record, but you'd often get artifacts and degredation after time has passed. I have some drilled VHS tapes that looked perfect when they were originally recorded back in the mid 90s. Now they're riddled with dropouts and defects where the brand-name (and more expensive) SVHS tapes still look fine.

      Sometimes you DO get what you pay for. If you want to be a cheapskate, you take your chances... (note that digital VCRs use a completely different recording technology than the colour-under heterodyne VHS system, so they may work better with modified tapes/pins).

      N.

      --
      "Nothing strengthens authority so much as silence." - Charles de Gaulle
  9. The analogy to a floppy disk is perfect... by gearmonger · · Score: 4, Insightful
    ...they are both lame, outdated technologies.

    Seriously, why bother with this when there are so many better, faster, more capable storage media available today?

    --
    One if by troll, two if by redundant...

    1. Re:The analogy to a floppy disk is perfect... by imsabbel · · Score: 2, Insightful

      er, dvhs has 1080i HDTV NOW, blue ray and hd-dvd are not here yet.

      --
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  10. Re:DAT and Tape by demon · · Score: 2, Insightful

    That's a pretty interesting trick... seeing as DAT cartridges aren't even the same dimensions as a conventional audiocassette. Maybe you're thinking of DCC (Digital Compact Cassette), a competing digital-audio-on-cassette standard from some years back?

    --

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  11. Re:Two Things by evilviper · · Score: 3, Insightful
    1080i runs almost 4mbyte/sec which means you'd get ~19 minutes recording time on your typical 4.7gb DVD-RW.

    This is stupid. There is no reason to store the full-bitrate MPEG-2 HDTV stream. You can requant the MPEG-2 in realtime, and perhaps halve the bitrate, without significant quality loss... So, you're up to 80 minutes on a single DVD (dual-layer)... Besides that, you can get much more significant gains by re-encoding to MPEG-4 (or VP6, WMV, etc) which would at least double that, giving you 160 minutes on a dual-layer DVD without noticable quality loss, or 80 minutes on your single-layer DVD. Since most movies run under 100 minutes or so, you would just have to lose slightly more quality to get it to fit on a dirt-cheap DVD.

    do you really want to use 9.4gb dual layer dvd-r for all your recordings? you do know how freaking expensive they are...

    Yes, they are less expensive than DVHS tapes. Even if they were more expensive, I think most people have come to realize the serious advantages to random-access storage.

    Besides, who need DVDs... USB2/Firewire hard drives are even better, cheap, and extremely high capacity.
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  12. Stupid is as stupid posts by rs79 · · Score: 4, Insightful

    "You got temporary storage gains, but your discs would quickly fail. Not a good deal in the meantime."

    Did you actually try it?

    Anybody that was used to day in day out 8" floppy operations knew a bit about what brands of media worked and what didn't. This data was applicable to 5" floppies and then 3".

    My first box of low density 3" floppies cost me $50 US.

    If you used cheap floppies and punchd them you'd get a certain failure rate roughly equivalent to the failure rate of unpunched floppies on low density drives. Crap is crap no matter how many holes you punch in it.

    I've used hundreds of punched disks. After a year of 18 hours a day they'd start to get errors, punched or unpunched. Use good media. Duh.

    <rant>
    It appears only 2 people besides me RTFA and slashdot is beginning to make usenet look as credible as a peer reviewed scientific journal by comparison.

    RTFA or don't bother posting. You may well be a clueless fucktard but posting here without reading no longer keeps this fact hidden. Spam waste less of my time than you nimrods.

    And spare me the friggin dupe alerts. If that's all you have to say then STFU.
    </rant>

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