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some questions about SSHD as storage drives

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80251

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Dec 12, 2020
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1. What's the maximum SSD size for an SSHD?

2. If you use an SSHD as an internal storage drive does the SSD write cache only get flushed to the HDD when it's full?

3. can you configure an SSHD so that all the on-board SSD cache is used as a write cache (e.g. if you use another, separate SSD as a read cache)?

4. will the HDD spin down if there's no data to be read/written to the platters (i.e. it's all in the SSD cache)?
 
The only SSHD's I have used are Seagate based. They don't make them anymore.

1. With those the maximum SSD size was 8 GB.

2. No the write cache only holds your most commonly used files on the drive.

3. No you cannot, the provisioning is done by the Controller on the drive.

4. Yes it will spin down but the SSD Cache only stores (mostly) exe files from programs.

The truth is that SSHDs are no longer viable. You can easily buy a 1 or 2 TB SSD for less than a new SSHD and I would not buy a used one. While they did serve a purpose you can do the same with AMD Store MI and be a little more flexible. Something like a 512GB SSD and 2 TB SSD would do what you are thinking.
 
80251 said:
@kapone32
What happens if the SSD cache fails prematurely? Is the data on the HDD still safe?
Click to expand...
No the storage cannot be used as the software is configured to have the SSD drive what the HDD does. You might be able to recover the data with Disk Mgmt software but I doubt you would be able to use it. These filled a niche when a 256GB SSD would cost as much as a 1TB SSHD. All the Cache did was rival SSDs in Windows start times (after a few loads) or Game that you put it on. There is also the fact the 4K gets destroyed as you are getting HDD speeds and the worst SSD is still noticeably faster than a HDD. With the advent of M2 adoption on MBs NVME actually seems to be finally priced more fairly.
 
@Shrek
That's some wild HDD tech. Apparently, in the case of a power outage, the drive will utilize the rotational energy of the platters to write any DRAM cached data to the flash memory!
 

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