: Unused space on hard drives recovered?

Salut tuturor!
am gasit un articol la urmatoarea adresa:
Am incercat si eu metoda, dar nu a mers. Intr-adevar am cistigat la un hdd de 80 GB (de fapt cca. 74 Gb) inca 74 Gb (practic l-am dublat), dar in momentul in care copiam date pe una din cele doua partitii, se stergeau datele de pe cealalta, unde era sistemul de operare (Xp profesional). Datele le copiam fie de pe un alt hdd, fie de pe o partitie pe alta.
Totusi am citit pe net, ca unora le-a mers ( datele nu s-au corupt, sistemul de operare a butat fara probleme, partitiile au putut fi formatate, defragmentate, umplute pina la refuz, fara a se pierde informatie )! As vrea sa stiu daca a mai incercat si altcineva, si daca metoda a dat rezultate! Ar fi extrem de folositor sa poti sa iti dublezi HDD! Oricum HDD nu a patit nimic, ca l-am formatat din nou si l-am partitionat in 3!
Imi cer scuze, trebuiam sa postez in rubrica STORAGE, dar acolo nu am putut posta mesajul!

Opinii ale userilor cu experienta:

About the "recover unused space on your drive" article:

Working for a data-recovery company I know a thing or two about harddisks....

One is that if the vendors would be able to double the capacity for just about nothing, they would.

All this probably does is to create an invailid partition table which ends up having:

|...new partition.............................
|old partition.................................|

overlapping partitions. So writing either partition will corrupt the other. It probably so happens that whatever situation people tried it, it just so happened that the (quick) format of the "new" partition didn't corrupt the other partition to make it unbootable.

And the 200G -> 510Gb "upgrade" probably has ended up with three overlapping partitions....

What is happening is that Norton Ghost creates a virtual partition on the drive, and the data for that virtual partition resides on one of the existing partitions. So as more data is added on the virtual partition, a file on the normal drive partition expands as well.

It's kind of like a disk image which is being mounted to a drive letter. All the data for it is still on the primary partition.

Hopefully that's clear enough to explain what is happening here. The extra virtual partition basically is defined as the amount of freespace on the partition to which the that virtual partition file actually resides.

In short: No miracle space here, don't bother the hard drives manufactures. Just using a feature in ghost in a weird way, but with no real benifits other than being able to boot a disk image without reszing all the partitions on your drive.

First, users are usually amused to learn that the capacity of modern hard drives is _unknown_, until it goes through the factory's qualification tests. The 120GB hard drive you purchased may have been physically identical to a 250GB hard drive, but simply it only passed qualification at 120GB.

Intel does the same thing with processors. A 3.0Ghz processor may be sold as 2.4Ghz, simply because it didn't pass qualification at 3.0Ghz but did at a lower clock speed.

Second, in the ATA standard there is a feature known as the "host protected area". This area is accessible from any OS -- but it requires special ATA commands in order to make this area available to the OS.

Third, all hard drives reserve a certain amount of free space to use for reallocation of bad sectors. These "spare sectors" are free space on your drive... completely unused until your hard drive starts finding problems on the physical media.

So this is old news :) Although the host-protected area (HPA) can be used for insidious purposes such as DRM/CPRM that is completely hidden from the users, most of the "invisible free space" exists for a purpose -- either it's spare sectors for bad sector remapping, or its capacity that didn't pass factory qualification, that you don't want to use anyway.

Concluzie: ...nu tot ce zboara... :cheesy:

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