Thank you Lee, appreciate your time and help, you explain in a way that even I can understand….
John > On May 7, 2018, at 11:17 AM, Lee Larson <leelar...@me.com> wrote: > > On May 7, 2018, at 10:23 AM, John Robinson <profilecoven...@icloud.com > <mailto:profilecoven...@icloud.com>> wrote: > >> Lee, when you and some of your geek friends talk it’s hard for a slurp the >> syrup guy like me to know what you are talking about, hard links, forks, and >> a USB RUST-Based drive… >> >> To further my non existent education can you elaborate on these three >> subjects, I sure know what a USB drive is but one with Rust, I need to learn. > > A rust-based drive is a not-so-serious way of describing a traditional hard > drive. They use a spinning platter coated with iron oxide to store data. Rust > is iron oxide. > > Hard links are a different matter. > > On most Unix-type file systems, a file has two parts: a data part and a > filename part. The data part is associated with something called an inode, > which contains a list of such stuff as where the data is and file > permissions. The filename part has the name of the file and a pointer telling > which inode contains the file information. More than one filename can point > at the same inode. These multiple filename parts are called hard links to the > file. > > This means that to really delete a file, you have to delete all the hard > links. When the operating system sees there are no more links to an inode, it > removes that inode and marks all the associated blocks on the hard drive as > free for over-writing. > > This differs from a soft link. A soft link to a file is basically just > another file that contains the address of the file to which it is linked. > This is the idea behind aliases in MacOS. If you delete the linked file, the > alias is still there and you’ll get some sort of “file not found” error if > you try to use it. > > Time Machine makes heavy use of hard links to avoid having multiple copies of > the same file on a backup disk. > > L^2 > > --- > Lee Larson leelar...@me.com <mailto:leelar...@me.com> > > Give a man a fire and he's warm for a day, but set fire to him and he's warm > for the rest of his life. — Terry Pratchett > Jingo > > > > > > > > > _______________________________________________ > MacGroup mailing list > Posting address: MacGroup@erdos.math.louisville.edu > Archive: > <https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mail-2Darchive.com_macgroup-40erdos.math.louisville.edu_&d=DwIFaQ&c=OAG1LQNACBDguGvBeNj18Swhr9TMTjS-x4O_KuapPgY&r=F2GFXrjLFqVo3VwvIlo_XYeEiRRjHv15rxcenz7A21woG2aFGcrzndoSsskxfmOs&m=nNiPma_nFQyjNQ65HW3JIAIGWRyNDTxjkauJy96z0rw&s=cENQRRzIZvOXS33CYmjCKbN66yNlcakAkdCzBLEShA0&e=> > Answers to questions: <http://erdos.math.louisville.edu/macgroup/>
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