No, if you have a 128 bit block and a 16 bit check code, you'll get the same check code for approximately 2**(128-16) blocks (aka 2**112).
- Vote on answer
- posted
11 years ago
CRC codes
Loading thread data ...
- Vote on answer
- posted
11 years ago
[Snipped by Lyons]
Hello Poncho, I haven't read this complete thread. But remember, if someone does build a reliable CRC system, they didn't build that. Some one else made that happen.
[-Rick-]- Vote on answer
- posted
11 years ago
I was under the impression that CRCs are generally designed and used to detect errors, for example in packets sent over the Internet ...
I was looking for strong evidence that advanced error-correcting codes were used in hard drives.
Hitachi produces enterprise-class hard-drives, which tend to pack more GB per square inch, spin faster and have lower error rates.
From this piece from 2008, one learns that they produced dense packing based in part on LDPC codes (low-density parity check codes):
<
formatting link
> .
-- More recently, they've done production od drives that use LDPC codes: From the spec. document for Deskstar 5K3000 & Ultrastar 5K3000 hard disk drives: "576 bit LDPC in 512 byte format"
- Vote on answer
- posted
11 years ago
Early tape drives used longitudinal and vertical parity bits for error checking. AFAIK the first use of a CRC was in data communications during the mid 1960's.
-- Shmuel (Seymour J.) Metz, SysProg and JOAT Unsolicited bulk E-mail subject to legal action. I reserve the right to publicly post or ridicule any abusive E-mail. Reply to domain Patriot dot net user shmuel+news to contact me. Do not reply to spamtrap@library.lspace.org