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700MB vs. 650MB compatibility with CD-RW

Trish's Escape from Hardware Hell Help Board » Hardware » CD, CDR, CDRW and DVD Related » 700MB vs. 650MB compatibility with CD-RW « Previous Next »

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Posted on Saturday, July 26, 2003 - 8:21 am:   

I have a HP-8100 series CD-Writer which is very slow 2x RW/4x CDR, but I can live with that. The problem seems to be that in Win98 with HP Adaptec software, this drive refuses to format 700MB 80 min. CD-RW discs. It will format 650MB 74 min. discs and will write to 700MB CDR discs, but cant handle 700MB CD-RW. Is this typical of some drives, especially older slower ones or is something fried or is it software?
Posted on Saturday, July 26, 2003 - 5:53 pm:   

That is typical, the cdrw doesn't recognize the density of 700mb cdrw disks.
Posted on Saturday, July 26, 2003 - 9:19 pm:   

Thanks for the reply. So, 700MB CDR is not the same density as 700MB CDRW? I still wonder because using the cdrecord program in linux I was able to format and write to 700MB CDRW discs, but it would format them as 650MB - ignoring 50MB. Maybe the discs were misprinted or something or because cdrecord uses scsi commands or...
Posted on Sunday, July 27, 2003 - 8:29 pm:   

I think it is more in the way linux handles the media compared to windows and this in turn affects the way hardware behaves so Linux tells the CDRW to format at 650 MB instead of the 700 MB the Disk is capable of. Linux from what I understand, has better direct to hardware access as opposed to Windows approach to hardware in layers such as ASPI, or in Win2k and XP as HAL (hardware access layer). I suppose I should have been clearer in my post and said Windows won't let the CDRW recognize the media as anything but 700mb. As far as the actual density of cdr and cdrw media goes, yes they are two different chemical density's as well as two totally different chemical properties. If refering to density as areal density or size there is no difference.

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