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what is "DRIVE SHIM"

post #1 of 5
Thread Starter 
ok so i have a new teacher and he keeps talking about a drive shim, according to him its a piece of hardware that allows the cmos to see hard drives that are bigger then what the cmos is capable of reading and i just want to know if any one has ever heard of this Drive shim thing of if my teacher is just incompetent.
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post #2 of 5
If I remember correctly, it was an old method of extending partitions, or adding seperate partitions to equal one large drive, when the physical drive in question was bigger than an old BIOS could support.

Nowadays we have different methods for this same thing for drives that are 3+TB.
post #3 of 5
Thread Starter 
ok thank you if you could, could you give me some links or names on the methods used today?
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post #4 of 5
You would basically be extending your partition, until you hit the 3TB wall. Then some board manufacturers have built in features to overcome this, and some ( like asrock ) you need to install included software to "unlock" the ability.
post #5 of 5
I think your teacher means "BIOS extender", something that about all plug-in hard disk controllers have. I've seen only one such card that was just a ROM chip, a Promise ISA card that added support for 137GB drives. Almost all drive controllers sold in the past 10 years have a BIOS chip for 48-bit LBA support, and while 48-bit LBA can handle up to 144,000TB, I don't think any of those controllers can directly handle drives bigger than 2TB, the same size limit as non-UEFI motherboard BIOSes.

Another way to handle big drives, including booting from them, is with a "software overlay", or "dynamic disk overlay" (DDO), the most famous one being Ontrack's Disk Manager. Seagate provides it so its > 2TB drives can be fully utilized with older motherboards and with 32-bit operating systems..



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