Red Hat Bugzilla – Bug 70445
Corrupt cd-rom data transfers
Last modified: 2007-04-18 12:45:05 EDT
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User-Agent: Mozilla/4.0 (compatible; MSIE 5.5; Windows 98; T312461)
Description of problem:
I have corrupted data transfers from my cd-rom/cdrw
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Copy any larger file from cdrom/cdrw drive
2.Unpack or check MD5-sum
Actual Results: The file is copied without any error messages, but during
unpacking or installing there are errors (rpm checksum etc.). I found, that
after enabling DMA for cdrom, this problem disappears. This bug appeared with
1. Comp Athlon 1800+, 256 MB DDR RAM, ABIT KR7, Cyberhome DVD drive
2. Comp Athlon 1700+, 256 MB DDR RAM, Soltek SL-75DRV4, NEC CDRW
do you know if dma is enabled for the cdrom drive?
In default it is disabled from 7.3 and in /etc/proc/ide/hdc/settings is 0 in
DMA collumn. After enabling DMA the transfers are without corruptions
(through /etc/sysconfig/harddiskhdc). As I wrote the same think happened with
different board and drive. I had already problems with verifying Redhat install
CD`s. The checksum was sometimes OK, but sometimes not. With DMA enabled,
checksums were OK everytime.
Seems to be fixed in latest kernels 2.4.18-5 and 2.4.18-10. Thanks.