Replace OS drive, question about other 3 drives / 2 in RAID

Hey Guys,
I am wanting to swap out my main hard drive with a new drive (preventive maintenance) after 3 years of working my system like a horse, and upgrade to Snow Leopard.
My question is, if I have the other 3 bays filled with drives, 2 of which are a RAID set up, can I just swap the main drive and install the new OS on it without it messing up the RAID set up? or are there steps I need to be aware of before doing this? Do I need to remove the drives and re-set up the RAID? I think you know where I am going with this.
Obviously the RAID drives are my critical data so I just want to be sure before making changes.
I appreciate any help you can provide.
Peace - JK

I did find the answer to this for those curious.
The guys at "Mac Matters" in Phoenix were very helpful when I approached them with this question after clarifying a bit.
There are 4 drives. Mac HD / bay 2 & 3 are RAID / Bay 4 - On the desktop only 3 drives show.
You can remove the MAC HD and replace without it affecting the other 3 drives even though 2 of them are in a RAID array.
Hope this helps someone down the road.
Best - JK

Similar Messages

K8T Master 2 FAR; Hard Drive Questions About

Greetings!
I just got off the Google bus and stubbed my toe on your doorstep. What luck!
I have many questions, and it's getting harder to find answers for a mainboard that's not being sold "new" anymore. I did see some other topics that go along lines similar to my own, but I figured it would be a good idea to open a new thread with my specific questions.
I have decided to split my questions into three parts. This is part one, "hard drive" questions.
HARD DRIVE RELATED:
Western Digital recently announced a new high-capacity SATA Raptor drive, with 150 GB of storage:
1) Can I mount two of them into my K8T Master 2 FAR system and "hardware stripe" them for Windows/XP?
....1A) If yes, is there a minimum recommended BIOS that I should be running?
....1B) If no, then would it be feasibile to "software stripe" them in Windows/XP Pro?
If I decide to proceed, I will be well-prepared to accept the risk of data loss that would occur if one drive were to crash.
I currently run my system with a removable SATA drive caddy for my system drive. This makes it easy to swap OS's by swapping hard drives without opening my CPU case. If I go with a dual-striped SATA drive arrangement and two Raptors, then I'll replace that removable caddy with a unit that can accomodate two SATA drives.
....1C) Once in a blue moon, I get a BSOD after having swapped SATA drives. It happens when I first boot Windows/XP after having run Linux. Hot-swappable claims notwithstanding, I always swap drives while the system is powered down, although I don't typically shut off the hardware switch at the power power supply. Are there any known issues or reports of other people having similar occurrences?
I also run some IDE devices for data and archival purposes. My system is typically set up as follows:
CH 0/0 - Data drive
CH 0/1 - DVD burner
CH 1/0 - Data drive
CH 1/1 - Data drive
Recently, my system stopped "seeing" any hard drives on CH 1 drive 1. Known good drives won't show up in the BIOS, and auto-detect doesn't "see" a drive in that position. I have tried more than one drive, and the problem stays on that channel and position. I swapped cables with a known good cable, and the problem stays on that channel and position. For the time being, I have disconnected one of the data drives...but I'd really like to resolve this issue if possible.
....1D) Are there any known problems or issues with "disappearing IDE devices" in the K8T Master 2 FAR?
Thanks in advance!

Can't say, this is the first time I hear about SATA caddies....
Maybe a bad contact or so?
Sata is pretty sensitive to connection problems, or even folded cables for that matter...

####a question about jdbc driver

A question about jdbc driver: for Oracle JDBC drivers which will not allow O/R
tools to access columns over 4 kb. This affects some of the functionality of my
application.A workaround is to use the my JDBC driver that acts as a wrapper to
ensure that columns over 4 kb read and persist properly. my JDBC driver determines
which actual driver to load based on the connection URL. If you pass in a URL
that contains the string jdbc:oracle:thin, it will know to load oracle.jdbc.driver.OracleDriver.
If the URL contains the string jdbc:db2, it will know to load COM.ibm.db2.jdbc.net.DB2Driver,
and so on.
now i have set CLASSPATH for my jdbc wapper,when I Creating and Configuring a
JDBC Connection Pool,i have to input my driver name such com.lawrence.driver.....then
i did,all
is well,then i restart my WLS,when load config.xml,some errors such as "No registered
driver accept URL:jdbc:oracle:thin:@localhost:1521:lawrence",if i set driver name
is oracle.jdbc.driver.OracleDriver,all is good,no any errors.
I find some questions like:
1.for WLS8.1 ,it is only find some registed driver?
2.why it cannot load my driver wapper when it is loading jdbc Connection Pool,but
when the WLS start is finished, i Creating and Configuring a JDBC Connection Pool
then it is right?

my JDBC driver like this:
public class myDriver implements Driver {
     public static String DB2_DRIVER = "COM.ibm.db2.jdbc.net.DB2Driver";
     public static String DB2_URL = "jdbc:db2:";
     public static String HYPERSONIC_DRIVER = "org.hsqldb.jdbcDriver";
     public static String HYPERSONIC_URL = "jdbc:hsqldb:";
     public static String MYSQL_DRIVER = "com.mysql.jdbc.Driver";
     public static String MYSQL_URL = "jdbc:mysql:";
     public static String ORACLE_DRIVER = "oracle.jdbc.driver.OracleDriver";
     public static String ORACLE_URL = "jdbc:oracle:";
     public static String POSTGRESQL_DRIVER = "org.postgresql.Driver";
     public static String POSTGRESQL_URL = "jdbc:postgresql:";
     public static String SQLSERVER_DRIVER =
          "com.microsoft.jdbc.sqlserver.SQLServerDriver";
     public static String SQLSERVER_URL = "jdbc:microsoft:";
     public boolean acceptsURL(String url) throws SQLException {
          return true;
     public synchronized Connection connect(String url, Properties props)
          throws SQLException {
          if (_driver == null) {
               Class driverClass = null;
               try {
                    if (url.startsWith(DB2_URL)) {
                         driverClass = Class.forName(DB2_DRIVER);
                    else if (url.startsWith(HYPERSONIC_URL)) {
                         driverClass = Class.forName(HYPERSONIC_DRIVER);
                    else if (url.startsWith(MYSQL_URL)) {
                         driverClass = Class.forName(MYSQL_DRIVER);
                    else if (url.startsWith(ORACLE_URL)) {
                         driverClass = Class.forName(ORACLE_DRIVER);
                    else if (url.startsWith(POSTGRESQL_URL)) {
                         driverClass = Class.forName(POSTGRESQL_DRIVER);
                    else if (url.startsWith(SQLSERVER_URL)) {
                         driverClass = Class.forName(SQLSERVER_DRIVER);
                    _driver = (Driver)driverClass.newInstance();
               catch (Exception e) {
                    throw new SQLException(e.getMessage());
          Connection con = _driver.connect(url, props);
          return new myConnection(con);
     public int getMajorVersion() {
          return _driver.getMajorVersion();
     public int getMinorVersion() {
          return _driver.getMinorVersion();
     public DriverPropertyInfo[] getPropertyInfo(String url, Properties props)
          throws SQLException {
          return _driver.getPropertyInfo(url, props);
     public boolean jdbcCompliant() {
          return _driver.jdbcCompliant();
     private Driver _driver;

Question about hard drives older xraid

We have an "older" XRaid stocked with 14 250 GB drives, connected to an xserve with fiber channel. Our premium Applecare agreement for the XRaid expired a few months ago. Prior to that, when a drive would fail, I would simply get a replacement from Apple, but I always kept a good spare drive in a drive module so that I could swap it in while waiting for the new module. I expect some drives to start failing as they get older, and buying drives in Apple drive modules is very expensive (over $600 for a 250 GB drive, if you can even find them). So my plan is to just buy bare drives and pop them into the existing drive modules when needed. My questions are:
Are these drives ATA's or SATA's?
What is the maximum drive size that each drive can be? Can I pull out all 7 drives on one side or the other and replace them with, say, 500 GB drives? (obviously I would have to re-init the array). Any help would be appreciated.

>Are these drives ATA's or SATA's?
The XServe RAID uses ATA 133 drives.
> What is the maximum drive size that each drive can be?
That depends on the firmware version. If you haven't updated the firmware since you got the machine, then 250GB is as big as you can go. If up update the firmware you can use 750GB drives (the largest drive currently available in the XServe RAID).
> I pull out all 7 drives on one side or the other and replace them with, say, 500 GB drives?
If you're not worried about warranty/support or the integrity of your data, sure. Lots of people have reported success doing this. Just be careful regarding the drives you get. Do NOT jump on the cheapest, nastiest drive you can find - there's a reason why that 750GB drive costs $99. All drives are NOT the same. You need to make sure you get server-rated drives. Most consumer/home drives are rated for something like 50,000 hours MBTF at 20% utilization (your home machine isn't always on, and is often idle even when it is on). By comparison, server drives have a much higher MTBF at a higher utilization (as much as 500,000 hours at 80% utilization).
If you don't care about drive failures then you can use the cheaper drives, just be prepared to deal with the failures.
Also, make sure you get identical make/model drives for al disks in the array. Mismatching drives in an array is going to cause a huge performance hit since the drives are not in sync.

Very basic questions about hard drives

I'm upgrading from vintage Beige G3, so much of the jargon about internal drives is new to me.
My MacPro will come with an OEM 160 GB drive. I will use this for my primary boot drive -- OS and Apps. All my data, photo files etc. will be kept on my second/third drives. I do not plan any sort of RAID setup. Windows is going nowhere near my Mac.
For the extra drives --
1) SATA? SATA II? What's the difference and is it critical?
1a) What is a "raptor" drive?
2) Does size matter (we're talking about GBs here, guys...)
3) Reliability is more important to me than speed or noise. We're a long long way from any technical help or even UPS.
4) Do new drives need to be formatted before using them internally?
5) If I partition one of the extra drives so I can keep a clean, backup OS boot partition, I need to format it as GUID, correct? Or does that just apply to external firewire boot drives? Does it matter which partition will be the boot partition?
6) I've read discussions about firmware requirements for some drives. What's that all about?
I was leaning toward MaxLine Pro 500 GB drives, but have been reading (reading too much, perhaps?) and now have all the above questions/concerns. (Whatever happened to the good ol' days of "buy an IDE drive, insert, play"?)
Thanks for your patience with these questions. I need to get it right the first time because of our remoteness!

1. SATA 1 interface speed rated at 1.5 Gb/s; SATA II interface speed rated at 3.0 Gb/s.
2. Drive ratings/performance is determined by many factors. You can best find out about individual drive performance by visiting http://www.storagereview.com/ to see their benchmark results on various drives. You will also find some helpful comparisons at http://www.barefeats.com/.
3. As for drive specs see previous answer. Generally speaking within any manufacturer's category of drive models for a given size the fastest drive will be the most expensive. Manufacturer specs usually do not provide any idea about drive performance in real world situations. Only benchmark comparisons are really useful, and even those can be confusing.
4. Yes, you can boot an Intel Mac from an APM partitioned drive. You simply cannot install OS X from the installer disc because it will refuse to install on a drive that has not been GUID partitioned.
5. Some older Seagate 750 GB models were not working properly when installed in a RAID configuration on Mac Pro computers. Seagate provided a firmware update to fix the problem for those who already owned the affected drives.
I don't know where you got the idea that Intel Macs were "picky about such things." Nor that installing drives in a beige G3 was a no-brainer. The old beige G3 required a lot of mechanical effort to mount a new drive internally. You not only had to connect all the various cables, but if you had two drives on the same ribbon cable each drive had to be jumpered properly - one as MASTER and one as SLAVE. Some older ATA hard drives had two different jumper settings for a MASTER - MASTER solo and MASTER w/SLAVE. Some beige G3 models wouldn't even boot OS X unless it was installed on a MASTER drive. And, you could not install OS X on a large drive except by partitioning the drive with an 8 GB partition for OS X that had to be the first partition on the drive. RAIDs may work or not depending on if you ran OS 9 or OS X. At least to me that wasn't the "good old days" unless you were comparing installing ATA drives to dealing with SCSI. I would say that in your particular case you were lucky, and you never tried putting two drives on the same ribbon cable. Oh, and I forgot about the size limiting jumper on most ATA large drives to limit capacity to 32 GBs because that's all that was supported by FAT32. Oh, yes, and the beige G3's disk controller did not support drives larger than 128 GBs.

Question about Raptor drives

I have a Mac Pro, obviously, and am considering using a Raptor drive for my boot drive.
I am new to Raptor drives, so can someone explain a few of my questions so I can determine if it is worth my money and time?
Basically, I am a photographer, shooting RAW, using Aperture and CS3. That is my main use of rthe computer. The files I shoot are from the Canon 1Ds Mark III and are huge (21 megapixel each).
If I use a Raptor drive as my boot drive with my OS and apps on it, how will this affect my red write speed on my other 3 internal drives (which are all Seagate 1 terabytes).
I also have an external RAID system for my ever growing library from Aperture as well. I shoot about 3 terabytes of images per year.
Is a raptor drive going to help me? Or because I won't sroe much on the main boot drive, is this silly?
Please, when explaining, or asking me for more information, try not to use TOO much tech speak. I know very little about this stuff.
I am learning ...

KevShootz wrote:
Please, when explaining, or asking me for more information, try not to use TOO much tech speak. I know very little about this stuff.
Then let me caution you against getting sucked into the speed-demon vortex. The minute you say Raptor, you immediately attract users who typically pay closer attention to their stop-watches than they do their retouching skills. Most don't even use Photoshop, which is why I recommend every photographer consult with MacGurus.com. The owners are photographers.
My new MacPro is FAST, especially when compared to my G4 MDD. Would I notice the millisecond differences if I had a Raptor for boot? No. I don't own a stop-watch. I sold my Raptor on eBay.
For photographers, memory seems to be the first key to speed. You may be better off budgeting for memory than trying to figure out how to put your OS safely on a Raptor so you can (not) see how much faster your system boots. Certainly, the more storage, the better. Be certain you understand the risks with RAID.
MacGurus has some great literature for photographer workstations. Don't hesitate to give them a call and speak to Rick or Brian if you need detailed answers. They are one helpful business, probably the best resource for photographers in the marketplace.

Question about NAS drives

Im looking to get some network attached storage for my home. I have a 20 inch iMac that is hard wired and a 15 inch macbook pro (not 802.11N). I have a linksys 802.11N router that i have set up. I want to attach a NAS, and was thinking about this one
http://www.westerndigital.com/en/products/Products.asp?DriveID=279
My questions.
1) Would it be fast enough?
2) If i put my itunes library on it and stream that to my Apple TV (when it gets here) will there be any buffer time?
3) I use FCP a lot and would use it as my capture disc, will that be fast?
4) Are there any other drives i should look at first?
As you can see im really worried about speed so anyone that can help please let me know. Thanks

-

Quick question about showing drive space

Hi,
Just got a quick query about showing remaining drive space on the desktop.
Before I wiped my Pismo and reinstalled Tiger (bad kernel panic), my hard drive and any other connected drives (pen drive, iPod, iDisk, etc) showed up on my Desktop with the name and drive capacity and remaining space underneath the icon.
Now I've reinstalled, the drive capacity and remaining space don't show up on the Desktop, and I can't find how to turn it on. I've been through Preferences several times and can't find an obvious switch. Have I missed something? I'm running Tiger 10.4.8 with the machine spec below.
Thanks in advance,
Rob Johnson

Sometimes, for no obvious reason, the Finder can be slow to update. And sometimes it updates instantly. Why? "Only the Shadow knows...." or maybe the Apple programmers.
Francine
Francine
Schwieder

Question about Hard drive Space and Logic Pro

We just installed Logic Pro 7.2 (and Tiger) onto our Dual G4. We have nearly filled the bootup drive, with tonnes of space on our other hard drives (80GB and 100GB). With only ~4 GB left on the startup drive, will this cause problems with Logic Pro? We have more than the recommended RAM, but I was wondering if the hard drive space might be an issue, like with iDVD where you need ~8-10 GB free to burn a DVD.
I've been considering copying things over from my startup drive to my 80GB drive (which has tiger on it too)and making the 80 GB drive my new startup drive, but it's a bit of work and if I don't need to do it right away I don't want to bother. What is the recommended amount of free hard drive space and memory for Logic Pro to work well? I personally like to have ~10GB free for anything, but that might be tricky at this point. I want to know if I should go through with the hassle of moving things over or wait a bit and see how it goes. I've not ahd a chance to use the program yet, but I'd like to set it up and keep it working smoothly once I start to use it. Any advice or experience from anyone in this department?

Your best off having at least 25% free space of any hard drive.
With Logic, It is a good idea (though not necessary) to have your OS and apps on one HD, and your song files and samples (and other files) on another. I would also suggest that you get a hard drive with a speed of at least 7200rpms.

Question about hard drive space used

If I run OmniDiskSweeper to sweep my 15" G4 laptop hard drive, the total file size calculated is 31.3 GB. Likewise, if I clone the hard drive to an external drive using SuperDuper!, the total size used on the external drive is 31.3 GB.
However, if I "Get Info" on the laptop hard drive, the Used size listed is 41.9 GB. Likewise, 41.6 GB is listed as "used" in the OmniDiskSweeper Drive List window, as well as in another utility. I suspect that the 41.6 value is picked up from the Finder.
What could be the reason that Get Info lists the space used on the hard drive as 10 GB larger than the total size of the files?
1.5 GHZ PowerPC G4 Mac OS X (10.4.9)
Dual 2 GHz G5 Mac OS X (10.4.4)

Hmm, I think I have a possible answer. I had to download OmniDiskSweeper and open the help from its Help menu to get this answer.
It says in the help for OmniDiskSweeper:
"OmniDiskSweeper only displays files that you have access to from the user account you are logged into. Files in restricted folders are not available and their sizes are not included in the total file sizes you see."
So, if you have other user accounts, then those files won't necessarily be readable and hence not counted in OmniDiskSweeper. There may also be a few system files and folders that might be unreadable and hence not counted. That should be fine since you probably shouldn't be randomly deleting system files.
I've also noticed that OmniDiskSweeper shows slight variations of total sizes in its different windows, so it's not too precise. That probably comes from the dynamic nature of hard drive use by the computer, and OmniDiskSweeper trying not to use too many cpu cycles updating incessantly. Just guessing on that part though.
The 10GB is most likely other user accounts or something else not readable from your own account. The Finder lets you know of course, but OmniDiskSweeper only presents to you what you have permission to access. That doesn't necessarily mean you'll also have permission to delete those things.

Questions about Hard Drive Replacement

I am debating putting in a new Hard Drive 100GB. I am not very technical but have changed memory in my MacBook to 1GB. I am a bit nervous about doing this. I have read the Apple Doc on doing it and was wondering about the tab. How does the tab connect to the new drive? Is it all as easy as it looks? Just pop the old one out, put the new one in and reboot holding down the c key? Reformat the drive and then install osx? I was wondering how many people have already done it and their experiences with it? Thanks

On a MacBook, the HD swap is very simple. Because the drive is SATA, the connections are sturdier than former ATA drives and you don't have to worry about snapping off the connecting pins.
The white "tab" used to pull the drive is just a piece of thin plastic glued onto the tray. Not the most sturdy stuff, but it'll do it's job. When you pull, just pull straight out - don't twist or turn the tab! Same goes for inserting the new drive: push straight in so it stays aligned with the rubber mounting rails.
*If you want to save the data, the best way to install a new hard drive is to:
1. Buy the new drive AND an external firewire case (USB will also work)
2. Put the new drive in the external case
3. Use "Carbon Copy Cloner" to duplicate your existing drive to the external one
4. Physically swap the drives and OSX should boot from your newly installed drive as if nothing changed.
Once you upgrade to a 7200RPM, the following things will be noticeably faster:
System Startup
Opening of any application
Anything that requires lots of HD reading/writing.
The last category includes any video/sound editing, such as Garageband, iMovie and iDVD. Shuffling through your iPhoto collection should also be faster. You might not notice the difference though, since the MacBook is already pretty fast
I would definitely couple it with a ram upgrade as well. With a large amount of physical ram, the HD upgrade won't make as much of a difference.

Question about hard drive, need help lol.

Hey I'm kinda new to the MacBook world and have a stupid question. I am getting a late 2009 MacBook unibody (white polycarbonate, model MacBook 6.1... I believe) I am switching the original 250gb 5400 rpm hard drive out for a Seagate Momentus XT 750gb 7400 rpm hybrid hard drive. I want to keep everything on the original hard drive and just pop the new hard drive and start fresh with Snow Leopard. I'm going to purchase the SL cd from apple but I do not have the original grey start up cd that came with it (my girlfriends little sister lost it). Do I need to call apple for that cd in order to start fresh on my new hard drive or is everything I need on the SL cd?
Also how do I go about wiping the whole computer when I put the hard drive in and use SL? I want to essentially have a completely clean laptop with a new hard drive.
Thanks for your help in advance.

The SL disc you get from Apple will do everything you need. When you nstall the new hard drive there will be nothing to wipe, the drive is the only piece of that Mac hat stores anything so you don't need to worry about that. Post back and let me know how that hybrid drive works out....I'm interested.

Partitioning External Hard Drive- questions about software & filing system

I just got my macbook and I want to use my older external hard drive to transfer data between the macbook and my PC desktop. I have a Maxtor OneTouch II 300gb with only one partition. I have about 80gb of data already on the Maxtor. So my two questions are . .
1. What is the best software (prefer freeware) to partition my Maxtor and keep the data I already have on it? Or is there a better way?
2. What is the best setup for the filing system for the partitions? NTFS for one and FAT32 for the other or something else? I want to be able to both read & write to the Maxtor from both the PC and Mac. Appreciate any help anyone can throw my way.
Macbook- Black model Mac OS X (10.4.6)

I'm not quite sure of what you mean by:
I would like to avoid
moving all the stuff from the external drive to the
mac, and then having to move it all back onto the
external drive.
But most external drive was formated using fat 32 which theoretically limit to 2 TB and file size limit to 4 GB. Just put a useless file from your pc, and connect your external to your MacBook ,and see if you can copy and or delete that file from your Mac.
You can also check your HD format on PC side by: go to my computer, right click the external HD icon and select properties, and it will shows you the hd was formatted with,...
If you mean you want to format to mac format "on the fly", they might be some utilities for that on Mac side, but I'm not aware of, but why you want to re-format it if the external work for both sides without getting new format, since format that using MAc extended journaled wight result unreadable on your PC side.
Good Luck

Satellite A100-599 - question about display driver update

Hi,
I have a Satellite A100-599 with a NVIDIA 7600go graphic card and I have Bioshock like most of you the game crashes because of some problems with the graphic card drivers, no pb...in the meantime NVIDIA released some new patches to the Forceware and after I rechecked the Toshiba driver support database I saw a new release in the Display driver list for WinXp.
One of them seems to be from 13/09/2007. I downloaded the drivers, installed them and after I checked the driver details in the Device manager list and to my surprise the details said the drivers are from 2006. I reinstalled the drivers and the same thing appeared. I checked the XML that was in the drivers archive and surprise ...the drivers are really the old ones from 2006. So my question is this: Do you have any Display Drivers for my model that work for Bioshock :D
Regards,Marian

I dont know if WE have. I think it would be took some long time to ask every single user: hey, do you have some drivers for blackmodjo? Ah, come on, please. Just a little bit of them... ;)
No, I have a better idea. Its like cooking a meal. The ingredients: DriverCleaner Pro and the website www.laptopvideo2go.com and .... ta ta ta TAAAA a lot of patience
To get some good "bio"shocked meal just follow this receipt:
Go to
http://www.laptopvideo2go.com/
read before you do anything (YES, even before you continue BREATHING) the FAQ-section on that site (RECOMMENDEDRECOMMENDEDRECOMMENDED)
and then download the drivers. Do it, yes...
Then download drivercleaner by searching for it on www.google.com and THEN, read their Manual before doing anything else (Ok, you can continue breathing..)
After reading their manual you will something like:
1. Starting program, doing something, restarting machine
2. starting in safe mode, starting that program, removing..yadayadayada
3. Installing new driver
3. Playing Bioshock
4...
5..no..6. Thanking me and giving me your first born.. ;)
So, by cutting away around 40% of my humoristic stuff and following the constructive technical instructions from me you will be able to play bioshock.
Greets :)

Question about current driv

Hello,
Sorry if this has been covered before, but I didn't recieve an installation CD with my Audigy 2 card when I got it years ago, and I have used the current, most recent Audigy 2 drivers on this website which say they are an improvement over the ones on the disk, to install the Audigy 2 on my PC for the first time (after a reformat). Do these have the same function as the ones from the installation disk?
Also, the previous drivers released before the most recent ones state they allow EAX support and more, do I need to install these ones over the most recent ones I just talked about, or is everything I need in the most recent drivers?

Thalin,
If you can identify which Audigy 2 you have, (and find it in this list) you can download the install CD from here and install the creative software as well as the driver.Message Edited by Katman on 02-4-200604:2 PM

Replace OS drive, question about other 3 drives / 2 in RAID

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