Re: Low Level read/Write code for USB storage device
Jean-Luc Arnaud <jean-luc-E/[email protected]> Fri, 14 Dec 2018 18:54:33 +0100
| Newsgroups | gmane.comp.lang.realbasic.user |
|---|---|
| Organization | Centre Direct du Multimédia |
| Message-ID | <[email protected]> |
--------------800882A20AB4E656631EE70A Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Many thanks for replying, Jim. Your information is very interesting and relevant. However, I "need" to clone USB stick as it's the only way I can think to, to duplicate multi-partition sticks. Unless you have another idea? If so, I'm highly interested! Have a nice WE Jean-Luc Arnaud Le 14/12/2018 à 17:04, Jim Wagner a écrit : > Hello, Jean-Luc > > I do not think that you should try to “clone” a USB stick at “low > level”, that is, at the sector or block level. That is because of a > process used on solid-state memories (such as USB stick); this is > called “wear leveling”. For example, if you change a document on such > memory, it will actually move it to a new place so that the different > parts of the memory all have a chance to be written and no part gets > written too many times. > > Certainly, you can reconstruct partitions and such, but you need to do > it at a file-system level. Perhaps, this is what you are calling “low > level”? > > Jim > > James Wagner > Oregon Research Electronics > http://www.orelectronics.net > > > > >> On Dec 14, 2018, at 1:56 AM, Jean-Luc Arnaud >> <jean-luc-E/[email protected] <mailto:jean-luc-E/[email protected]>> wrote: >> >> Hi all, >> >> I plan to code for a kind of "USB Stick cloner" running on Windows, >> that is to make an >> image of the entire content of a USB Storage device, in order to copy it >> to another USB stick. >> >> I'd like to read low level information about partition table, >> catalog, etc.. and of course, to copy this information to another stick. >> >> I didn't find nothing useful in the Xojo forum nor in MBS samples. >> >> After a lot of searches on Internet (information like APIs, Command >> Line tools, shared code, ...), I'm now interested in an open-source >> utility, Clonezilla, which does all I need. >> >> Does someone know and/or use this utility? >> My goal is to adapt its source for my own needs, including it in a >> Xojo app. >> >> Thanks for any help. >> >> -- >> Jean-Luc Arnaud >> > --------------800882A20AB4E656631EE70A Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> <p>Many thanks for replying, Jim.</p> <p>Your information is very interesting and relevant. However, I "need" to clone USB stick as it's the only way I can think to, to duplicate multi-partition sticks.</p> <p>Unless you have another idea? If so, I'm highly interested!</p> <p>Have a nice WE<br> </p> <pre class="moz-signature" cols="72">Jean-Luc Arnaud </pre> <div class="moz-cite-prefix">Le 14/12/2018 à 17:04, Jim Wagner a écrit :<br> </div> <blockquote type="cite" cite="mid:932C2719-7B90-4DED-B38C-3447CAC45578-Wuw85uim5zDR7s880joybQ@public.gmane.org"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> Hello, Jean-Luc <div class=""><br class=""> </div> <div class="">I do not think that you should try to “clone” a USB stick at “low level”, that is, at the sector or block level. That is because of a process used on solid-state memories (such as USB stick); this is called “wear leveling”. For example, if you change a document on such memory, it will actually move it to a new place so that the different parts of the memory all have a chance to be written and no part gets written too many times.</div> <div class=""><br class=""> </div> <div class="">Certainly, you can reconstruct partitions and such, but you need to do it at a file-system level. Perhaps, this is what you are calling “low level”?</div> <div class=""><br class=""> </div> <div class="">Jim</div> <div class=""><br class=""> <div class=""> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;"> <div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""> <div class="">James Wagner</div> <div class="">Oregon Research Electronics</div> <div class=""><a href="http://www.orelectronics.net" class="" moz-do-not-send="true">http://www.orelectronics.net</a></div> <div class=""><br class=""> </div> </div> </span><br class="Apple-interchange-newline"> <br class="Apple-interchange-newline"> </div> <br class=""> <div> <blockquote type="cite" class=""> <div class="">On Dec 14, 2018, at 1:56 AM, Jean-Luc Arnaud <<a href="mailto:jean-luc-E/[email protected]" class="" moz-do-not-send="true">jean-luc-E/[email protected]</a>> wrote:</div> <br class="Apple-interchange-newline"> <div class=""> <div class="">Hi all,<br class=""> <br class=""> I plan to code for a kind of "USB Stick cloner" running on Windows, that is to make an<br class=""> image of the entire content of a USB Storage device, in order to copy it<br class=""> to another USB stick.<br class=""> <br class=""> I'd like to read low level information about partition table,<br class=""> catalog, etc.. and of course, to copy this information to another stick.<br class=""> <br class=""> I didn't find nothing useful in the Xojo forum nor in MBS samples.<br class=""> <br class=""> After a lot of searches on Internet (information like APIs, Command Line tools, shared code, ...), I'm now interested in an open-source utility, Clonezilla, which does all I need.<br class=""> <br class=""> Does someone know and/or use this utility?<br class=""> My goal is to adapt its source for my own needs, including it in a Xojo app.<br class=""> <br class=""> Thanks for any help.<br class=""> <br class=""> -- <br class=""> Jean-Luc Arnaud<br class=""> <br class=""> </div> </div> </blockquote> </div> <br class=""> </div> </blockquote> </body> </html> --------------800882A20AB4E656631EE70A--