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HDD for CCTV

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  HDD for CCTV mick crane <mick.crane@gmail.com> - 2020-11-13 09:00 +0100
    Re: HDD for CCTV Reco <recoverym4n@enotuniq.net> - 2020-11-13 09:20 +0100
      Re: HDD for CCTV mick crane <mick.crane@gmail.com> - 2020-11-13 09:40 +0100
    Re: HDD for CCTV "Alexander V. Makartsev" <avbetev@gmail.com> - 2020-11-13 10:00 +0100

#228615 — HDD for CCTV

regarding earlier post with do not reply request.
There's loads of HDDs advertised as "for CCTV, like a PC disk"
Is there some difference between HDDs for video recording and regular PC 
HDDs ?

mick
-- 
Key ID    4BFEBB31

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#228616

	Hi.

On Fri, Nov 13, 2020 at 07:56:24AM +0000, mick crane wrote:
> regarding earlier post with do not reply request.
> There's loads of HDDs advertised as "for CCTV, like a PC disk"
> Is there some difference between HDDs for video recording and regular PC HDDs ?

Yup, a critical one.
Conventional HDD (aka CMR) it the thing that allows you to use it any
way you want.
New wave HDD (aka SMR) are OK if you use them to write a single
append-only file, and dangerously bad at anything else.

Stay away from those CCTV HDDs, things will eat your data - [1], [2],
[3].

Reco

[1] https://en.wikipedia.org/wiki/Shingled_magnetic_recording
[2] https://www.truenas.com/community/resources/list-of-known-smr-drives.141/
[3] https://www.tomshardware.com/news/wd-lists-all-drives-slower-smr-techNOLOGY

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#228619

On 2020-11-13 08:11, Reco wrote:
> Hi.
> 
> On Fri, Nov 13, 2020 at 07:56:24AM +0000, mick crane wrote:
>> regarding earlier post with do not reply request.
>> There's loads of HDDs advertised as "for CCTV, like a PC disk"
>> Is there some difference between HDDs for video recording and regular 
>> PC HDDs ?
> 
> Yup, a critical one.
> Conventional HDD (aka CMR) it the thing that allows you to use it any
> way you want.
> New wave HDD (aka SMR) are OK if you use them to write a single
> append-only file, and dangerously bad at anything else.
> 
> Stay away from those CCTV HDDs, things will eat your data - [1], [2],
> [3].
> 
> Reco
> 
> [1] https://en.wikipedia.org/wiki/Shingled_magnetic_recording
> [2] 
> https://www.truenas.com/community/resources/list-of-known-smr-drives.141/
> [3] 
> https://www.tomshardware.com/news/wd-lists-all-drives-slower-smr-techNOLOGY


Cheers, likely saved me some grief there.
mick
-- 
Key ID    4BFEBB31

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#228620

[Multipart message — attachments visible in raw view] — view raw

On 13.11.2020 12:56, mick crane wrote:
> regarding earlier post with do not reply request.
> There's loads of HDDs advertised as "for CCTV, like a PC disk"
> Is there some difference between HDDs for video recording and regular 
> PC HDDs ?
>
> mick
In addition to Reco's advice, some HDDs have special programming in 
their firmware, which basically prevents the drive from falling into 
recovery loop until system is rebooted once they encounter a bad block.
It is called SCT Error Recovery Control [1] and could be checked using 
"smartctl -l scterc /dev/sdX".
HDD manufacturers often name their products with this feature as "Pro", 
"NAS edition", "RAID edition", etc, but it is always necessary to check 
full specifications for the product in official datasheet.


[1] https://en.wikipedia.org/wiki/Error_recovery_control

-- 
With kindest regards, Alexander.

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