-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Carlos E. R. wrote:
On Wednesday, 2009-04-22 at 13:12 -0500, Rajko M. wrote:
Perhaps because they use lenses made of plastic, instead of glass.
Whatever is the reason there is professional class of devices that can be used for mass burning, but the price is also "professional".
One wonders if buying one of those is worth it, considering that when those pesky devices fail you don't know what it is happening, except that verify fails, or worse, read fails a month later or when you send them away.
When mine fails, first thing I think is software.
-- Cheers, Carlos E. R.
We are talking data here not multi-media and somewhat different rules apply between the two usages. Most of these devices are targeted at multi-media usage or commercial data media (and I suspect the latter are not so much burnt as printed). While multi-media optical formats are designed to handle data loss by a combination of low level data integrity checks and file formats that are designed to handle block data errors. Most file systems do not have the latter protection. Data can be flagged as bad because the block fails the CRC integrity check, (possibly due to the integrity check being incorrect rather than the data being corrupt) and be lost to the FS (or even to some low level data reading software such as dd). RW format media data loss can be unacceptably high after relatively few write operations. Dust, hairs and stray small wildlife can ruin a burn (or read) operation. Ideally CD-RAM or DVD-RAM devices with caddy held media are a lot more reliable as an optical data storage option. (But both media and devices are difficult to find and relatively expensive). Another thing to remember is that DVD and CD are different low level formats and CD supports some data descriptors that DVD does not. (This potentially could cause problems on some devices if CD image is burnt to DVD media or vice versa). - -- ============================================================================== I have always wished that my computer would be as easy to use as my telephone. My wish has come true. I no longer know how to use my telephone. Bjarne Stroustrup ============================================================================== -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iEYEARECAAYFAknwMcUACgkQasN0sSnLmgLCXwCg8fdjTTZtxbkS83bWDbI3RpU6 mUwAn1R380cPRKLLNJ0DjY6AFnk1LA+n =iFqH -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org