Bug 70445 - Corrupt cd-rom data transfers
Corrupt cd-rom data transfers
Status: CLOSED ERRATA
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
7.3
athlon Linux
medium Severity high
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Assigned To: Arjan van de Ven
Brian Brock
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Depends On:
Blocks:
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Reported: 2002-08-01 10:27 EDT by Vaclav "sHINOBI" Misek
Modified: 2007-04-18 12:45 EDT (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2002-08-02 05:26:48 EDT
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Description Vaclav "sHINOBI" Misek 2002-08-01 10:27:38 EDT
From Bugzilla Helper:
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):


How reproducible:
Sometimes

Steps to Reproduce:
1.Copy any larger file from cdrom/cdrw drive
2.Unpack or check MD5-sum
3.
	

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 
version 7.3.

Additional info:

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
Comment 1 Arjan van de Ven 2002-08-01 10:30:31 EDT
do you know if dma is enabled for the cdrom drive?
Comment 2 Vaclav "sHINOBI" Misek 2002-08-02 05:26:44 EDT
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.
Comment 3 Vaclav "sHINOBI" Misek 2002-08-26 07:27:54 EDT
Seems to be fixed in latest kernels 2.4.18-5 and 2.4.18-10. Thanks.

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