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"Switch Out" Physical HDD (hard disk drive)
Hi,
I have a NEC desktop computer (1999) with Win98se. This has two physical HDDs (my modification), an internal "Master" HDD and a removable drawer for a "Slave" HDD. Note: I couldn't get this two HDD system to "work" using CS (cable select). I would like to add a 2 pole switch in the wires that supply power to the internal HDD so I can "switch out" the internal HDD (make it "disappear") when I want to put a "Master" drive in the drawer. Will this "work"? If not, do you know of another method? Thank You in advance, John |
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"Switch Out" Physical HDD (hard disk drive)
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"Switch Out" Physical HDD (hard disk drive)
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"Switch Out" Physical HDD (hard disk drive)
Lostgallifreyan wrote in
: I also have an internal optical disk writer as master on the second IDE buss. Small extra point about that... If you ever want to experiment with 'live' operating system CD's or DVD's, this is the way to go because they almost certainly expect to boot from the master of the muss, not the slave. I forget several other reasons, but I found that using the master of the second buss for optical writers was generally far better than using the slave position on either buss. (But switch off 'auto-insert notification' using the OS system property config pages, because that way no intensive reads, or auto-runs, happen. Better to only have that stuff happen when directly requested (or refreshed by F5 key) by you.) |
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"Switch Out" Physical HDD (hard disk drive)
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"Switch Out" Physical HDD (hard disk drive)
"J. P. Gilliver (John)" wrote in
: Also, the processor - which is implementing the OS - will think it is reading, or worse writing, to a certain place on the disc, and then suddenly will be connected to a different disc. Actually the disk controller should keep track of that on its own disk, the OS won't see that stuff personally, but there's still plenty to go wrong, not least the cache... |
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"Switch Out" Physical HDD (hard disk drive)
"J. P. Gilliver (John)" wrote in
: If you're only going to operate your switch when the power is off, then I can't see why it shouldn't work. And you wouldn't really need a 2 pole switch, though most switches available to the hobbyist are two pole anyway; just switching the red line ought to suffice, I think. Both is probably safer, though. I didn't think that through before, but now I am, and I'd avoid it/ Maybe two poles, one for 12V, one for 5V, but I'd leave the ground commoned at all times, otherwise you might get momentary flows from one supply line to the other, and I wouldn't be placing any bets on outcomes. Never mind harmful or not, undefined behaviour is code's greatest enemy, so avoid it... |
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"Switch Out" Physical HDD (hard disk drive)
"Bill in Co" wrote in
m: I'd second that. I sure wouldn't try it (switching it when the power is on). I don't mind taking some risks, but I think that is a big one, for all the reasons stated. I think my drive trays let me stop the power when I turn the key. I never eplored this much because of the risk, but what I do know: The drive powers down, and will wake safely after restoring locked state, so long as the disk was booted properly to start with. What I don't know: if data is lost when doing this after a write due to a non-purged cache... I think I tried a read- only swap after boot once to see what happened. If I remember right, not a lot did. I think it might as well have been a 3.5 inch wide brick. I had to put the original one back, and I rebooted anyway just to be safe. |
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